screen(1) 맨 페이지 - 윈디하나의 솔라나라

개요

섹션
맨 페이지 이름
검색(S)

screen(1)

SCREEN(1)                   General Commands Manual                  SCREEN(1)



NAME
       screen - screen manager with VT100/ANSI terminal emulation



SYNOPSIS
       screen [ -options ] [ cmd [ args ] ]
       screen -r [[pid.]tty[.host]]
       screen -r sessionowner/[[pid.]tty[.host]]



DESCRIPTION
       Screen is a full-screen window manager that multiplexes a physical ter‐
       minal between several processes (typically interactive  shells).   Each
       virtual terminal provides the functions of a DEC VT100 terminal and, in
       addition, several control functions from the ISO 6429  (ECMA  48,  ANSI
       X3.64)  and ISO 2022 standards (e.g. insert/delete line and support for
       multiple character sets).  There is a  scrollback  history  buffer  for
       each virtual terminal and a copy-and-paste mechanism that allows moving
       text regions between windows.

       When screen is called, it creates a single window with a  shell  in  it
       (or  the  specified  command) and then gets out of your way so that you
       can use the program as you normally would.  Then, at any time, you  can
       create new (full-screen) windows with other programs in them (including
       more shells), kill existing windows, view a list of windows, turn  out‐
       put  logging  on and off, copy-and-paste text between windows, view the
       scrollback history, switch between windows in whatever manner you wish,
       etc.  All  windows  run  their  programs completely independent of each
       other. Programs continue to run when their window is currently not vis‐
       ible and even when the whole screen session is detached from the user's
       terminal.  When a program terminates, screen (per  default)  kills  the
       window  that  contained  it.  If this window was in the foreground, the
       display switches to the previous  window;  if  none  are  left,  screen
       exits.  Shells  usually  distinguish  between running as login-shell or
       sub-shell.  Screen runs them as sub-shells, unless told otherwise  (See
       "shell" .screenrc command).

       Everything  you type is sent to the program running in the current win‐
       dow.  The only exception to this is the one keystroke that is  used  to
       initiate  a  command  to  the window manager.  By default, each command
       begins with a control-a (abbreviated C-a from now on), and is  followed
       by one other keystroke.  The command character and all the key bindings
       can be fully customized to be anything you like, though they are always
       two characters in length.

       Screen  does  not  understand the prefix "C-" to mean control, although
       this notation is used in this manual for readability.  Please  use  the
       caret  notation ("^A" instead of "C-a") as arguments to e.g. the escape
       command or the -e option.  Screen will also print out  control  charac‐
       ters in caret notation.

       The  standard way to create a new window is to type "C-a c".  This cre‐
       ates a new window running a shell and switches to that  window  immedi‐
       ately,  regardless  of  the state of the process running in the current
       window.  Similarly, you can create a new window with a  custom  command
       in  it  by  first binding the command to a keystroke (in your .screenrc
       file or at the "C-a :" command line) and then using it  just  like  the
       "C-a  c" command.  In addition, new windows can be created by running a
       command like:

              screen emacs prog.c

       from a shell prompt within a previously created window.  This will  not
       run  another  copy  of screen, but will instead supply the command name
       and its arguments to the window manager (specified in the $STY environ‐
       ment  variable)  who  will  use it to create the new window.  The above
       example would start the emacs editor (editing prog.c) and switch to its
       window. - Note that you cannot transport environment variables from the
       invoking shell to the application (emacs in this case), because  it  is
       forked from the parent screen process, not from the invoking shell.

       If  "/etc/utmp"  is  writable  by screen, an appropriate record will be
       written to this file for each window, and removed when  the  window  is
       terminated.   This  is useful for working with "talk", "script", "shut‐
       down", "rsend", "sccs" and other similar programs  that  use  the  utmp
       file to determine who you are. As long as screen is active on your ter‐
       minal, the terminal's own record is removed from  the  utmp  file.  See
       also "C-a L".



GETTING STARTED
       Before  you  begin to use screen you'll need to make sure you have cor‐
       rectly selected your terminal type, just as you  would  for  any  other
       termcap/terminfo program.  (You can do this by using tset for example.)

       If  you're  impatient  and want to get started without doing a lot more
       reading, you should remember this one command:  "C-a ?".  Typing  these
       two characters will display a list of the available screen commands and
       their bindings. Each keystroke is discussed in the section "DEFAULT KEY
       BINDINGS".  The  manual section "CUSTOMIZATION" deals with the contents
       of your .screenrc.

       If your terminal is a "true" auto-margin terminal (it doesn't allow the
       last position on the screen to be updated without scrolling the screen)
       consider using a version of your terminal's termcap that has  automatic
       margins  turned off. This will ensure an accurate and optimal update of
       the screen in all circumstances. Most terminals nowadays  have  "magic"
       margins  (automatic margins plus usable last column). This is the VT100
       style type and perfectly suited for screen.  If all  you've  got  is  a
       "true"  auto-margin  terminal  screen  will  be  content to use it, but
       updating a character put into the last position on the screen  may  not
       be  possible  until the screen scrolls or the character is moved into a
       safe position in some other way. This delay can be shortened by using a
       terminal with insert-character capability.



COMMAND-LINE OPTIONS
       Screen has the following command-line options:

       -a   include all capabilities (with some minor exceptions) in each win‐
            dow's termcap, even if screen must redraw parts of the display  in
            order to implement a function.

       -A   Adapt  the  sizes of all windows to the size of the current termi‐
            nal.  By default, screen tries to restore  its  old  window  sizes
            when  attaching  to  resizable  terminals  (those with "WS" in its
            description, e.g. suncmd or some xterm).

       -c file
            override the default configuration file from "$HOME/.screenrc"  to
            file.

       -d|-D [pid.tty.host]
            does  not  start screen, but detaches the elsewhere running screen
            session. It has the same effect as typing "C-a  d"  from  screen's
            controlling  terminal.  -D  is  the equivalent to the power detach
            key.  If no session can be detached, this option  is  ignored.  In
            combination  with  the  -r/-R  option more powerful effects can be
            achieved:

       -d -r   Reattach a session and if necessary detach it first.

       -d -R   Reattach a session and if necessary detach or  even  create  it
               first.

       -d -RR  Reattach  a  session  and if necessary detach or create it. Use
               the first session if more than one session is available.

       -D -r   Reattach a session. If necessary  detach  and  logout  remotely
               first.

       -D -R   Attach here and now. In detail this means: If a session is run‐
               ning, then reattach. If necessary detach  and  logout  remotely
               first.   If  it  was not running create it and notify the user.
               This is the author's favorite.

       -D -RR  Attach here and now. Whatever that means, just do it.

            Note: It is always a good idea to check the status  of  your  ses‐
            sions by means of "screen -list".

       -e xy
            specifies the command character to be x and the character generat‐
            ing a literal command character to y (when typed after the command
            character).   The default is "C-a" and `a', which can be specified
            as "-e^Aa".  When creating a screen session, this option sets  the
            default  command character. In a multiuser session all users added
            will start off with this command character. But when attaching  to
            an  already  running session, this option changes only the command
            character of the attaching user.  This  option  is  equivalent  to
            either the commands "defescape" or "escape" respectively.

       -f, -fn, and -fa
            turns  flow-control  on, off, or "automatic switching mode".  This
            can also be defined through the "defflow" .screenrc command.

       -h num
            Specifies the history scrollback buffer to be num lines high.

       -i   will cause the interrupt key (usually C-c) to interrupt  the  dis‐
            play  immediately  when  flow-control  is  on.   See the "defflow"
            .screenrc command for details.  The use of this option is discour‐
            aged.

       -l and -ln
            turns  login  mode  on  or off (for /etc/utmp updating).  This can
            also be defined through the "deflogin" .screenrc command.

       -ls [match]
       -list [match]
            does not start screen, but prints a list of  pid.tty.host  strings
            identifying  your screen sessions.  Sessions marked `detached' can
            be resumed with "screen -r". Those marked `attached'  are  running
            and  have a controlling terminal. If the session runs in multiuser
            mode, it is  marked  `multi'.  Sessions  marked  as  `unreachable'
            either  live  on  a  different host or are `dead'.  An unreachable
            session is considered dead, when its name matches either the  name
            of the local host, or the specified parameter, if any.  See the -r
            flag for a description how to construct matches.  Sessions  marked
            as `dead' should be thoroughly checked and removed.  Ask your sys‐
            tem administrator if you are not sure. Remove  sessions  with  the
            -wipe option.

       -L   tells screen to turn on automatic output logging for the windows.

       -Logfile file
            By  default logfile name is "screenlog.0". You can set new logfile
            name with the "-Logfile" option.

       -m   causes screen  to  ignore  the  $STY  environment  variable.  With
            "screen  -m"  creation  of  a  new session is enforced, regardless
            whether screen is called from within  another  screen  session  or
            not.  This  flag has a special meaning in connection with the `-d'
            option:

       -d -m   Start screen in "detached" mode. This creates a new session but
               doesn't  attach  to  it.  This  is  useful  for  system startup
               scripts.

       -D -m   This also starts screen in "detached" mode, but doesn't fork  a
               new process. The command exits if the session terminates.

       -O   selects  an optimal output mode for your terminal rather than true
            VT100 emulation (only affects auto-margin terminals without `LP').
            This  can  also  be  set in your .screenrc by specifying `OP' in a
            "termcap" command.

       -p number_or_name|-|=|+
            Preselect a window. This is useful when you want to reattach to  a
            specific  window or you want to send a command via the "-X" option
            to a specific window. As with screen's select command, "-" selects
            the  blank  window.  As a special case for reattach, "=" brings up
            the windowlist on the blank window, while a "+" will create a  new
            window.  The  command will not be executed if the specified window
            could not be found.

       -q   Suppress printing of error messages. In combination with "-ls" the
            exit  value  is  as  follows: 9 indicates a directory without ses‐
            sions. 10 indicates a directory with running  but  not  attachable
            sessions.  11 (or more) indicates 1 (or more) usable sessions.  In
            combination with "-r" the exit value is as follows:  10  indicates
            that  there  is  no session to resume. 12 (or more) indicates that
            there are 2 (or more) sessions to resume and  you  should  specify
            which one to choose.  In all other cases "-q" has no effect.

       -Q   Some  commands now can be queried from a remote session using this
            flag, e.g.  "screen  -Q  windows".  The  commands  will  send  the
            response  to  the  stdout of the querying process. If there was an
            error in the command, then the querying process will exit  with  a
            non-zero status.

            The commands that can be queried now are:
             echo
             info
             lastmsg
             number
             select
             time
             title
             windows

       -r [pid.tty.host]
       -r sessionowner/[pid.tty.host]
            resumes  a detached screen session.  No other options (except com‐
            binations with -d/-D) may be specified, though an optional  prefix
            of  [pid.]tty.host  may  be needed to distinguish between multiple
            detached screen sessions.  The second form is used to  connect  to
            another  user's  screen session which runs in multiuser mode. This
            indicates that screen should look for sessions in  another  user's
            directory. This requires setuid-root.

       -R   resumes  screen  only  when  it's unambiguous which one to attach,
            usually when only one screen is detached. Otherwise  lists  avail‐
            able  sessions.   -RR attempts to resume the first detached screen
            session it finds.  If successful, all other  command-line  options
            are  ignored.  If no detached session exists, starts a new session
            using the specified options, just as if -R had not been specified.
            The  option  is  set  by default if screen is run as a login-shell
            (actually screen uses "-xRR" in that case).  For combinations with
            the -d/-D option see there.

       -s program
            sets  the  default  shell to the program specified, instead of the
            value in the environment variable  $SHELL  (or  "/bin/sh"  if  not
            defined).   This can also be defined through the "shell" .screenrc
            command.  See also there.

       -S sessionname
            When creating a new session, this option can be used to specify  a
            meaningful  name for the session. This name identifies the session
            for "screen -list" and "screen -r"  actions.  It  substitutes  the
            default [tty.host] suffix.

       -t name
            sets  the  title  (a.k.a.) for the default shell or specified pro‐
            gram.  See also the "shelltitle" .screenrc command.

       -T term
            Set the $TERM environment variable using  the  specified  term  as
            opposed to the default setting of screen.

       -U   Run  screen in UTF-8 mode. This option tells screen that your ter‐
            minal sends and understands UTF-8 encoded characters. It also sets
            the default encoding for new windows to `utf8'.

       -v   Print version number.

       -wipe [match]
            does  the  same  as  "screen  -ls", but removes destroyed sessions
            instead of marking them as `dead'.  An unreachable session is con‐
            sidered  dead,  when its name matches either the name of the local
            host, or the explicitly given parameter, if any.  See the -r  flag
            for a description how to construct matches.

       -x   Attach  to  a  not  detached screen session. (Multi display mode).
            Screen refuses to attach from within itself.  But  when  cascading
            multiple screens, loops are not detected; take care.

       -X   Send  the  specified  command to a running screen session. You may
            use the -S option to specify the screen session if you  have  sev‐
            eral  screen  sessions running. You can use the -d or -r option to
            tell screen to look only for attached or detached screen sessions.
            Note  that  this  command  doesn't work if the session is password
            protected.


       -4   Resolve hostnames only to IPv4 addresses.

       -6   Resolve hostnames only to IPv6 addresses.

DEFAULT KEY BINDINGS
       As mentioned, each screen command consists of a "C-a" followed  by  one
       other  character.  For your convenience, all commands that are bound to
       lower-case letters are also bound to their control  character  counter‐
       parts (with the exception of "C-a a"; see below), thus, "C-a c" as well
       as "C-a C-c" can be used to create a window.  See  section  "CUSTOMIZA‐
       TION" for a description of the command.

       The following table shows the default key bindings. The trailing commas
       in boxes with multiple keystroke entries are separators,  not  part  of
       the bindings.

       tab(;); lb l l.  _ C-a ';(select);T{ Prompt for a window name or number
       to switch to.  T} _ C-a ";(windowlist -b);T{ Present a list of all win‐
       dows  for  selection.   T} _ C-a digit;(select 0-9);T{ Switch to window
       number 0 - 9 T} _ C-a -;(select -);T{ Switch to window number 0 - 9, or
       to the blank window.  T} _ C-a tab;(focus);T{ Switch the input focus to
       the  next  region.   See  also  split,  remove,  only.   T}  _  C-a  C-
       a;(other);T{ Toggle to the window displayed previously.  Note that this
       binding defaults to the command character typed twice, unless  overrid‐
       den.   For instance, if you use the option "-e]x", this command becomes
       "]]".  T} _ C-a a  ;(meta);T{ Send the command character (C-a) to  win‐
       dow. See escape command.  T} _ C-a A;(title);T{ Allow the user to enter
       a name for the current window.  T} _ T{ C-a b,
       C-a  C-b  T};(break);T{  Send  a   break   to   window.    T}   _   C-a
       B;(pow_break);T{ Reopen the terminal line and send a break.  T} _ T{ C-
       a c,
       C-a C-c T};(screen);T{ Create a new window with a shell and  switch  to
       that window.  T} _ C-a C;(clear);T{ Clear the screen.  T} _ T{ C-a d,
       C-a  C-d  T};(detach);T{  Detach screen from this terminal.  T} _ C-a D
       D;(pow_detach);T{ Detach and logout.  T} _ T{ C-a f,
       C-a C-f T};(flow);T{ Toggle flow on, off or auto.  T} _ C-a  F;(fit);T{
       Resize  the window to the current region size.  T} _ C-a C-g;(vbell);T{
       Toggles screen's visual bell mode.  T} _ C-a  h;(hardcopy);T{  Write  a
       hardcopy  of  the  current  window  to the file "hardcopy.n".  T} _ C-a
       H;(log);T{ Begins/ends logging  of  the  current  window  to  the  file
       "screenlog.n".  T} _ T{ C-a i,
       C-a C-i T};(info);T{ Show info about this window.  T} _ T{ C-a k,
       C-a C-k T};(kill);T{ Destroy current window.  T} _ T{ C-a l,
       C-a  C-l  T};(redisplay);T{  Fully  refresh  current  window.  T} _ C-a
       L;(login);T{ Toggle this windows login slot. Available only  if  screen
       is configured to update the utmp database.  T} _ T{ C-a m,
       C-a  C-m  T};(lastmsg);T{ Repeat the last message displayed in the mes‐
       sage line.  T} _ C-a M;(monitor);T{ Toggles monitoring of  the  current
       window.  T} _ T{ C-a space,
       C-a n,
       C-a C-n T};(next);T{ Switch to the next window.  T} _ C-a N;(number);T{
       Show the number (and title)  of  the  current  window.   T}  _  T{  C-a
       backspace,
       C-a C-h,
       C-a p,
       C-a C-p T};(prev);T{ Switch to the previous window (opposite of C-a n).
       T} _ T{ C-a q,
       C-a C-q T};(xon);T{ Send a control-q to the current window.  T}  _  C-a
       Q;(only);T{  Delete  all  regions but the current one.  See also split,
       remove, focus.  T} _ T{ C-a r,
       C-a C-r T};(wrap);T{ Toggle  the  current  window's  line-wrap  setting
       (turn  the current window's automatic margins on and off).  T} _ T{ C-a
       s,
       C-a C-s; T};(xoff);T{ Send a control-s to the current window.  T} _ C-a
       S;(split);T{  Split  the current region horizontally into two new ones.
       See also only, remove, focus.  T} _ T{ C-a t,
       C-a C-t T};(time);T{ Show system information.  T} _ C-a  v;(version);T{
       Display  the  version  and compilation date.  T} _ C-a C-v;(digraph);T{
       Enter digraph.  T} T{ C-a w,
       C-a C-w T};(windows);T{ Show a list of window.  T} _  C-a  W;(width);T{
       Toggle 80/132 columns.  T} _ C-a x or C-a C-x;(lockscreen);T{ Lock this
       terminal.  T} _ C-a X ;(remove);T{ Kill the current region.   See  also
       split, only, focus.  T} _ T{ C-a z,
       C-a  C-z T};(suspend);T{ Suspend screen.  Your system must support BSD-
       style job-control.  T} _ C-a Z;(reset);T{ Reset the virtual terminal to
       its "power-on" values.  T} _ C-a .;(dumptermcap);T{ Write out a ".term‐
       cap" file.   T}  _  C-a  ?;(help);T{  Show  key  bindings.   T}  _  C-a
       \;(quit);T{   Kill   all  windows  and  terminate  screen.   T}  _  C-a
       :;(colon);T{ Enter command line mode.  T} _ T{ C-a [,
       C-a C-[,
       C-a esc T};(copy);T{ Enter copy/scrollback mode.  T} _ T{ C-a C-],
       C-a ] T};(paste .);T{ Write the contents of the  paste  buffer  to  the
       stdin queue of the current window.  T} _ T{ C-a {,
       C-a  }  T};(history);T{ Copy and paste a previous (command) line.  T} _
       C-a >;(writebuf);T{ Write paste buffer to a file.  T}  _  C-a  <;(read‐
       buf);T{ Reads the screen-exchange file into the paste buffer.  T} _ C-a
       =;(removebuf);T{ Removes the file used by C-a < and C-a >.   T}  _  C-a
       ,;(license);T{  Shows where screen comes from, where it went to and why
       you can use it.  T} _ C-a _;(silence);T{ Start/stop monitoring the cur‐
       rent window for inactivity.  T} _ C-a |;(split -v);T{ Split the current
       region vertically into two new ones.  T} _ C-a *;(displays);T{  Show  a
       listing of all currently attached displays.  T} _


CUSTOMIZATION
       The  "socket  directory"  defaults either to $HOME/.screen or simply to
       /tmp/screens or preferably to  /usr/local/screens  chosen  at  compile-
       time. If screen is installed setuid-root, then the administrator should
       compile screen with an adequate (not NFS mounted) socket directory.  If
       screen  is  not  running setuid-root, the user can specify any mode 700
       directory in the environment variable $SCREENDIR.

       When screen is invoked, it executes initialization  commands  from  the
       files  "/usr/local/etc/screenrc"  and  ".screenrc"  in  the user's home
       directory. These are the "programmer's defaults" that can be overridden
       in the following ways: for the global screenrc file screen searches for
       the environment variable $SYSSCREENRC (this  override  feature  may  be
       disabled  at compile-time). The user specific screenrc file is searched
       in $SCREENRC, then $HOME/.screenrc.  The command line option  -c  takes
       precedence over the above user screenrc files.

       Commands  in  these  files  are  used to set options, bind functions to
       keys, and to automatically establish one or more windows at the  begin‐
       ning  of  your  screen session.  Commands are listed one per line, with
       empty lines being ignored.  A command's arguments are separated by tabs
       or  spaces,  and  may  be surrounded by single or double quotes.  A `#'
       turns the rest of the line into a comment, except in quotes.   Unintel‐
       ligible  lines are warned about and ignored.  Commands may contain ref‐
       erences to environment variables. The syntax is the shell-like "$VAR  "
       or "${VAR}". Note that this causes incompatibility with previous screen
       versions, as now the '$'-character has to be protected with '\'  if  no
       variable  substitution shall be performed. A string in single-quotes is
       also protected from variable substitution.

       Two configuration files are shipped as examples with your  screen  dis‐
       tribution:  "etc/screenrc" and "etc/etcscreenrc". They contain a number
       of useful examples for various commands.

       Customization can also be done 'on-line'. To  enter  the  command  mode
       type  `C-a  :'.  Note  that commands starting with "def" change default
       values, while others change current settings.

       The following commands are available:

       acladd usernames [crypted-pw]

       addacl usernames

       Enable users to fully access this screen session. Usernames can be  one
       user or a comma separated list of users. This command enables to attach
       to the screen session and performs the equivalent of `aclchg  usernames
       +rwx  "#?"'.   executed.  To add a user with restricted access, use the
       `aclchg' command below.  If an optional second parameter  is  supplied,
       it  should  be  a crypted password for the named user(s). `Addacl' is a
       synonym to `acladd'.  Multi user mode only.

       aclchg usernames permbits list

       chacl usernames permbits list

       Change permissions for a comma separated list of users. Permission bits
       are  represented  as `r', `w' and `x'. Prefixing `+' grants the permis‐
       sion, `-' removes it. The third parameter is a comma separated list  of
       commands and/or windows (specified either by number or title). The spe‐
       cial list `#' refers to all windows, `?' to all commands. if  usernames
       consists of a single `*', all known users are affected.

       A  command  can  be executed when the user has the `x' bit for it.  The
       user can type input to a window when he has its  `w'  bit  set  and  no
       other  user  obtains  a writelock for this window.  Other bits are cur‐
       rently ignored.  To withdraw the writelock from another user in  window
       2: `aclchg username -w+w 2'.  To allow read-only access to the session:
       `aclchg username -w "#"'. As soon as a user's name is known  to  screen
       he can attach to the session and (per default) has full permissions for
       all command and windows. Execution permission  for  the  acl  commands,
       `at'  and  others  should  also  be  removed or the user may be able to
       regain write permission.  Rights of the special username nobody  cannot
       be  changed  (see the "su" command).  `Chacl' is a synonym to `aclchg'.
       Multi user mode only.

       acldel username

       Remove a user from screen's access control list. If currently attached,
       all the user's displays are detached from the session. He cannot attach
       again.  Multi user mode only.

       aclgrp username [groupname]

       Creates groups of users that share common access rights.  The  name  of
       the group is the username of the group leader. Each member of the group
       inherits the permissions that are granted to  the  group  leader.  That
       means,  if  a user fails an access check, another check is made for the
       group leader.  A user is removed from  all  groups  the  special  value
       "none"  is  used for groupname.  If the second parameter is omitted all
       groups the user is in are listed.

       aclumask [[ users ] +bits | [ users ] -bits... ]

       umask [[ users ] +bits | [ users ] -bits... ]

       This specifies the access other users have to windows that will be cre‐
       ated  by  the  caller  of the command.  Users may be no, one or a comma
       separated list of known usernames. If no users are specified, a list of
       all  currently  known  users  is  assumed.   Bits is any combination of
       access control bits allowed defined with the "aclchg" command. The spe‐
       cial  username  "?" predefines the access that not yet known users will
       be granted to any window initially.  The special username  "??"  prede‐
       fines  the  access that not yet known users are granted to any command.
       Rights of the special username nobody cannot be changed (see  the  "su"
       command).  `Umask' is a synonym to `aclumask'.

       activity message

       When  any  activity  occurs  in a background window that is being moni‐
       tored, screen displays a notification in the message line.  The notifi‐
       cation  message  can  be re-defined by means of the "activity" command.
       Each occurrence of `%' in message is replaced by the number of the win‐
       dow  in  which  activity  has  occurred, and each occurrence of `^G' is
       replaced by the definition for bell in your termcap (usually an audible
       bell).  The default message is

                   'Activity in window %n'

       Note  that  monitoring  is  off  for all windows by default, but can be
       altered by use of the "monitor" command (C-a M).

       allpartial on|off

       If set to on, only the current  cursor  line  is  refreshed  on  window
       change.   This  affects  all  windows  and  is useful for slow terminal
       lines. The previous setting of full/partial refresh for each window  is
       restored with "allpartial off".  This is a global flag that immediately
       takes effect on all windows overriding the "partial" settings. It  does
       not change the default redraw behavior of newly created windows.

       altscreen on|off

       If  set  to on, "alternate screen" support is enabled in virtual termi‐
       nals, just like in xterm.  Initial setting is `off'.

       at [identifier][#|*|%] command [args ... ]

       Execute a command at other displays  or  windows  as  if  it  had  been
       entered there.  "At" changes the context (the `current window' or `cur‐
       rent display' setting) of the command. If the first parameter describes
       a  non-unique  context, the command will be executed multiple times. If
       the first parameter is of the form  `identifier*'  then  identifier  is
       matched against user names.  The command is executed once for each dis‐
       play of the selected user(s). If the first parameter  is  of  the  form
       `identifier%'  identifier  is  matched  against  displays. Displays are
       named after the ttys they attach. The prefix `/dev/' or `/dev/tty'  may
       be  omitted  from  the  identifier.  If identifier has a `#' or nothing
       appended it is matched against window numbers and titles.  Omitting  an
       identifier in front of the `#', `*' or `%'-character selects all users,
       displays or windows because a prefix-match is performed. Note  that  on
       the  affected  display(s)  a short message will describe what happened.
       Permission is checked for initiator of the "at" command,  not  for  the
       owners  of  the affected display(s).  Note that the '#' character works
       as a comment introducer when it is preceded by whitespace. This can  be
       escaped by prefixing a '\'.  Permission is checked for the initiator of
       the "at" command, not for the owners of the affected display(s).

       Caveat: When matching against windows, the command is executed at least
       once  per window. Commands that change the internal arrangement of win‐
       dows (like "other") may be called again. In shared windows the  command
       will be repeated for each attached display. Beware, when issuing toggle
       commands like "login"!  Some commands (e.g. "process") require  that  a
       display  is associated with the target windows.  These commands may not
       work correctly under "at" looping over windows.

       attrcolor attrib [attribute/color-modifier]

       This command can be used to highlight attributes by changing the  color
       of  the  text.  If  the  attribute  attrib  is  in  use,  the specified
       attribute/color modifier is also applied. If no modifier is given,  the
       current one is deleted. See the "STRING ESCAPES" chapter for the syntax
       of the modifier. Screen understands two pseudo-attributes,  "i"  stands
       for  high-intensity  foreground  color and "I" for high-intensity back‐
       ground color.

       Examples:

              attrcolor b "R"

       Change the color to bright red if bold text is to be printed.

              attrcolor u "-u b"

       Use blue text instead of underline.

              attrcolor b ".I"

       Use bright colors for  bold  text.  Most  terminal  emulators  do  this
       already.

              attrcolor i "+b"

       Make bright colored text also bold.

       autodetach on|off

       Sets  whether screen will automatically detach upon hangup, which saves
       all your running programs until they are resumed with a screen -r  com‐
       mand.   When  turned off, a hangup signal will terminate screen and all
       the processes it contains. Autodetach is on by default.

       autonuke on|off

       Sets whether a clear screen sequence should nuke all  the  output  that
       has not been written to the terminal. See also "obuflimit".

       backtick id lifespan autorefresh cmd args...

       backtick id

       Program  the  backtick command with the numerical id id.  The output of
       such a command is used for substitution of the "%`" string escape.  The
       specified  lifespan  is  the number of seconds the output is considered
       valid. After this time, the command is run  again  if  a  corresponding
       string  escape  is  encountered.  The autorefresh parameter triggers an
       automatic refresh for caption and hardstatus strings after  the  speci‐
       fied  number  of seconds. Only the last line of output is used for sub‐
       stitution.

       If both the lifespan and the autorefresh parameters are zero, the back‐
       tick  program is expected to stay in the background and generate output
       once in a while.  In this case, the command is executed right away  and
       screen  stores  the  last  line  of  output. If a new line gets printed
       screen will automatically refresh the hardstatus or the captions.

       The second form of the command deletes the backtick  command  with  the
       numerical id id.

       bce [on|off]

       Change background-color-erase setting. If "bce" is set to on, all char‐
       acters cleared by an erase/insert/scroll/clear operation will  be  dis‐
       played  in  the  current  background color. Otherwise the default back‐
       ground color is used.

       bell_msg [message]

       When a bell character is sent to a background window, screen displays a
       notification  in the message line.  The notification message can be re-
       defined by this command.  Each occurrence of `%' in message is replaced
       by  the  number  of  the window to which a bell has been sent, and each
       occurrence of `^G' is replaced by the definition for bell in your term‐
       cap (usually an audible bell).  The default message is

                          'Bell in window %n'

       An  empty message can be supplied to the "bell_msg" command to suppress
       output of a message line (bell_msg "").  Without parameter, the current
       message is shown.

       bind [class] key [command [args]]

       Bind  a command to a key.  By default, most of the commands provided by
       screen are bound to one or more keys as indicated in the  "DEFAULT  KEY
       BINDINGS"  section, e.g. the command to create a new window is bound to
       "C-c" and "c".  The "bind" command can be  used  to  redefine  the  key
       bindings and to define new bindings.  The key argument is either a sin‐
       gle character, a two-character sequence of the form "^x"  (meaning  "C-
       x"), a backslash followed by an octal number (specifying the ASCII code
       of the character), or a backslash followed by a second character,  such
       as  "\^" or "\\".  The argument can also be quoted, if you like.  If no
       further argument is given, any previously established binding for  this
       key is removed.  The command argument can be any command listed in this
       section.

       If a command class is specified via the "-c" option, the key  is  bound
       for the specified class. Use the "command" command to activate a class.
       Command classes can be used to create multiple command keys  or  multi-
       character bindings.

       Some examples:

                   bind ' ' windows
                   bind ^k
                   bind k
                   bind K kill
                   bind ^f screen telnet foobar
                   bind \033 screen -ln -t root -h 1000 9 su

       would bind the space key to the command that displays a list of windows
       (so that the command usually invoked by "C-a C-w" would also be  avail‐
       able  as  "C-a  space").  The  next three lines remove the default kill
       binding from "C-a C-k" and "C-a k".  "C-a K" is then bound to the  kill
       command.  Then  it  binds  "C-f" to the command "create a window with a
       TELNET connection to foobar", and bind "escape"  to  the  command  that
       creates an non-login window with a.k.a. "root" in slot #9, with a supe‐
       ruser shell and a scrollback buffer of 1000 lines.

                   bind -c demo1 0 select 10
                   bind -c demo1 1 select 11
                   bind -c demo1 2 select 12
                   bindkey "^B" command -c demo1

       makes "C-b 0" select window 10, "C-b 1" window 11, etc.

                   bind -c demo2 0 select 10
                   bind -c demo2 1 select 11
                   bind -c demo2 2 select 12
                   bind - command -c demo2

       makes "C-a - 0" select window 10, "C-a - 1" window 11, etc.

       bindkey [-d] [-m] [-a] [[-k|-t] string [cmd-args]]

       This command manages screen's input translation tables. Every entry  in
       one  of  the  tables tells screen how to react if a certain sequence of
       characters is encountered. There are three tables: one that should con‐
       tain  actions  programmed by the user, one for the default actions used
       for terminal emulation and one for screen's  copy  mode  to  do  cursor
       movement.  See  section  "INPUT  TRANSLATION" for a list of default key
       bindings.

       If the -d option is given,  bindkey  modifies  the  default  table,  -m
       changes  the  copy mode table and with neither option the user table is
       selected.  The argument string is the sequence of characters  to  which
       an action is bound. This can either be a fixed string or a termcap key‐
       board capability name (selectable with the -k option).

       Some keys on a VT100 terminal can send a different string  if  applica‐
       tion  mode  is  turned  on  (e.g  the cursor keys).  Such keys have two
       entries in the translation table. You can select the  application  mode
       entry by specifying the -a option.

       The -t option tells screen not to do inter-character timing. One cannot
       turn off the timing if a termcap capability is used.

       Cmd can be any of screen's commands with an arbitrary number  of  args.
       If cmd is omitted the key-binding is removed from the table.

       Here are some examples of keyboard bindings:

               bindkey -d

       Show  all of the default key bindings. The application mode entries are
       marked with [A].

               bindkey -k k1 select 1

       Make the "F1" key switch to window one.

               bindkey -t foo stuff barfoo

       Make "foo" an abbreviation of the word "barfoo". Timeout is disabled so
       that users can type slowly.

               bindkey "\024" mapdefault

       This  key-binding  makes  "^T" an escape character for key-bindings. If
       you did the above "stuff barfoo" binding, you can enter the word  "foo"
       by  typing  "^Tfoo". If you want to insert a "^T" you have to press the
       key twice (i.e., escape the escape binding).

               bindkey -k F1 command

       Make the F11 (not F1!) key an alternative screen escape (besides ^A).

       break[duration]

       Send a break signal for duration*0.25 seconds to this window.  For non-
       Posix  systems  the  time  interval  may be rounded up to full seconds.
       Most useful if a character device is attached to the window rather than
       a shell process (See also chapter "WINDOW TYPES"). The maximum duration
       of a break signal is limited to 15 seconds.

       blanker

       Activate the screen blanker. First the screen is cleared. If no blanker
       program is defined, the cursor is turned off, otherwise, the program is
       started and it's output is written to the screen.  The  screen  blanker
       is killed with the first keypress, the read key is discarded.

       This command is normally used together with the "idle" command.

       blankerprg [program-args]

       Defines  a  blanker  program.  Disables the blanker program if an empty
       argument is given. Shows the currently set blanker program if no  argu‐
       ments are given.

       breaktype [tcsendbreak|TIOCSBRK|TCSBRK]

       Choose  one  of  the available methods of generating a break signal for
       terminal devices. This command should affect the current  window  only.
       But  it still behaves identical to "defbreaktype". This will be changed
       in the future.  Calling "breaktype"  with  no  parameter  displays  the
       break method for the current window.

       bufferfile [exchange-file]

       Change the filename used for reading and writing with the paste buffer.
       If the optional argument to the "bufferfile" command  is  omitted,  the
       default setting ("/tmp/screen-exchange") is reactivated.  The following
       example will paste the system's password file into  the  screen  window
       (using the paste buffer, where a copy remains):

                   C-a : bufferfile /etc/passwd
                   C-a < C-a ]
                   C-a : bufferfile

       bumpleft

       Swaps window with previous one on window list.

       bumpright

       Swaps window with next one on window list.

       c1 [on|off]

       Change  c1  code  processing.  "C1  on" tells screen to treat the input
       characters between 128 and 159 as control  functions.   Such  an  8-bit
       code  is  normally  the same as ESC followed by the corresponding 7-bit
       code. The default setting is to process c1 codes  and  can  be  changed
       with the "defc1" command.  Users with fonts that have usable characters
       in the c1 positions may want to turn this off.

       caption [ top | bottom ] always|splitonly[string]

       caption string [string]

       This command controls the display of the window  captions.  Normally  a
       caption  is  only  used if more than one window is shown on the display
       (split screen mode). But if the type is set to always  screen  shows  a
       caption even if only one window is displayed. The default is splitonly.

       The  second form changes the text used for the caption. You can use all
       escapes from the "STRING ESCAPES" chapter. Screen  uses  a  default  of
       `%3n %t'.

       You can mix both forms by providing a string as an additional argument.

       You  can  have the caption displayed either at the top or bottom of the
       window.  The default is bottom.

       charset set

       Change the current character set slot designation and charset  mapping.
       The  first  four  character  of  set are treated as charset designators
       while the fifth and sixth character must be in range '0' to '3' and set
       the GL/GR charset mapping. On every position a '.' may be used to indi‐
       cate that the corresponding charset/mapping should not be changed  (set
       is  padded  to  six characters internally by appending '.'  chars). New
       windows have "BBBB02" as default charset, unless a  "encoding"  command
       is active.
       The current setting can be viewed with the "info" command.

       chdir [directory]

       Change  the  current directory of screen to the specified directory or,
       if called without an argument, to your home directory (the value of the
       environment  variable $HOME).  All windows that are created by means of
       the "screen" command from within ".screenrc" or  by  means  of  "C-a  :
       screen  ..." or "C-a c" use this as their default directory.  Without a
       chdir command, this would  be  the  directory  from  which  screen  was
       invoked.

       Hardcopy  and  log  files  are  always  written to the window's default
       directory, not the current directory of the process running in the win‐
       dow.   You  can  use  this  command multiple times in your .screenrc to
       start various windows in different default directories,  but  the  last
       chdir value will affect all the windows you create interactively.

       cjkwidth [ on | off ]

       Treat ambiguous width characters as full/half width.

       clear

       Clears the current window and saves its image to the scrollback buffer.

       collapse

       Reorders window on window list, removing number gaps between them.

       colon [prefix]

       Allows  you  to  enter ".screenrc" command lines. Useful for on-the-fly
       modification of key bindings, specific  window  creation  and  changing
       settings.  Note  that  the "set" keyword no longer exists! Usually com‐
       mands affect the current window rather than default settings for future
       windows. Change defaults with commands starting with 'def...'.

       If you consider this as the `Ex command mode' of screen, you may regard
       "C-a esc" (copy mode) as its `Vi command mode'.

       command [-c class]

       This command has the same effect as typing the screen escape  character
       (^A).  It is probably only useful for key bindings.  If the "-c" option
       is given, select the specified command  class.   See  also  "bind"  and
       "bindkey".

       compacthist [on|off]

       This  tells  screen  whether  to  suppress  trailing  blank  lines when
       scrolling up text into the history buffer.

       console [on|off]

       Grabs or un-grabs the machines console output to a window.  Note:  Only
       the owner of /dev/console can grab the console output.  This command is
       only available if the machine supports the ioctl TIOCCONS.

       copy

       Enter copy/scrollback mode. This allows you to copy text from the  cur‐
       rent  window  and its history into the paste buffer. In this mode a vi-
       like `full screen editor' is active:
       The editor's movement keys are:


       tab(@); l l.  _ T{ h, C-h,
       left arrow T}@move the cursor left.  _ T{ j, C-n,
       down arrow T}@move the cursor down.  _ T{ k, C-p,
       up arrow T}@move the cursor up.  _ T{ l ('el'),
       right arrow T}@move the cursor right.  _ 0 (zero) C-a@move to the left‐
       most  column.   _  +  and -@positions one line up and down.  _ H, M and
       L@T{ move the cursor to the leftmost column of the top, center or  bot‐
       tom line of the window.  T} _ |@moves to the specified absolute column.
       _ g or home@moves to the beginning of the buffer.  _ G or end@T{  moves
       to  the specified absolute line (default: end of buffer).  T} _ %@jumps
       to the specified percentage of the buffer.  _ ^ or  $@T{  move  to  the
       leftmost  column,  to the first or last non-whitespace character on the
       line.  T} _ w, b, and e@move the cursor word by word.  _ B, E@move  the
       cursor  WORD  by  WORD  (as in vi).  _ f/F, t/T@T{ move the cursor for‐
       ward/backward to the next occurence of the target. (eg, '3fy' will move
       the  cursor  to  the 3rd 'y' to the right.)  T} _ ; and ,@T{ Repeat the
       last f/F/t/T command in the same/opposite direction.  T} _ C-e  and  C-
       y@T{ scroll the display up/down by one line while preserving the cursor
       position.  T} _ C-u and C-d@T{ scroll the display up/down by the speci‐
       fied  amount  of  lines while preserving the cursor position. (Default:
       half screen-full).  T} _ C-b and C-f@scroll the display up/down a  full
       screen.  _


       Note:  Emacs  style movement keys can be customized by a .screenrc com‐
       mand.  (E.g. markkeys "h=^B:l=^F:$=^E") There is no simple method for a
       full emacs-style keymap, as this involves multi-character codes.

       Some keys are defined to do mark and replace operations.

       The  copy  range  is  specified  by setting two marks. The text between
       these marks will be highlighted. Press:

              space or enter to set the first or second mark respectively.  If
              mousetrack  is  set  to  `on',  marks can also be set using left
              mouse click.

              Y and y used to mark one whole line or to  mark  from  start  of
              line.

              W marks exactly one word.

       Any  of  these  commands  can be prefixed with a repeat count number by
       pressing digits

              0..9 which is taken as a repeat count.

       Example: "C-a C-[ H 10 j 5 Y" will copy lines 11 to 15 into  the  paste
       buffer.

       The folllowing search keys are defined:

              / Vi-like search forward.

              ? Vi-like search backward.

              C-a s Emacs style incremental search forward.

              C-r Emacs style reverse i-search.

              n Find next search pattern.

              N Find previous search pattern.


       There  are  however some keys that act differently than in vi.  Vi does
       not allow one to yank rectangular blocks  of  text,  but  screen  does.
       Press:  c  or  C  to  set  the left or right margin respectively. If no
       repeat count is given, both default to the current cursor position.

       Example: Try this on a rather full text screen:

              "C-a [ M 20 l SPACE c 10 l 5 j C SPACE".

       This moves one to the middle line of the screen, moves  in  20  columns
       left,  marks  the  beginning of the paste buffer, sets the left column,
       moves 5 columns down, sets the right column, and then marks the end  of
       the paste buffer. Now try:

              "C-a [ M 20 l SPACE 10 l 5 j SPACE"

       and notice the difference in the amount of text copied.

       J joins lines. It toggles between 4 modes: lines separated by a newline
       character (012), lines glued seamless,  lines  separated  by  a  single
       whitespace  and  comma  separated  lines. Note that you can prepend the
       newline character with a carriage return character, by issuing a  "crlf
       on".

       v  or  V  is  for all the vi users with ":set numbers" - it toggles the
       left margin between column 9 and 1. Press

       a before the final space key to toggle in append mode.  Thus  the  con‐
       tents of the paste buffer will not be overwritten, but is appended to.

       A toggles in append mode and sets a (second) mark.

       > sets the (second) mark and writes the contents of the paste buffer to
       the screen-exchange file (/tmp/screen-exchange per default) once  copy-
       mode is finished.

       This  example  demonstrates  how to dump the whole scrollback buffer to
       that file: "C-A [ g SPACE G $ >".

       C-g gives information about the current line and column.

       x or o exchanges the first mark and the current  cursor  position.  You
       can use this to adjust an already placed mark.

       C-l ('el') will redraw the screen.

       @ does nothing. Does not even exit copy mode.

       All keys not described here exit copy mode.

       copy_reg [key]

       No longer exists, use "readreg" instead.

       crlf [on|off]

       This  affects  the copying of text regions with the `C-a [' command. If
       it is set to `on',  lines  will  be  separated  by  the  two  character
       sequence  `CR' - `LF'.  Otherwise (default) only `LF' is used.  When no
       parameter is given, the state is toggled.

       debug on|off

       Turns runtime debugging on or off. If screen  has  been  compiled  with
       option  -DDEBUG  debugging available and is turned on per default. Note
       that this command only affects debugging output from the main  "SCREEN"
       process  correctly.  Debug  output  from attacher processes can only be
       turned off once and forever.

       defc1 on|off

       Same as the c1 command except that the default setting for new  windows
       is changed. Initial setting is `on'.

       defautonuke on|off

       Same  as  the  autonuke command except that the default setting for new
       displays is changed. Initial setting is `off'.  Note that you  can  use
       the  special  `AN' terminal capability if you want to have a dependency
       on the terminal type.

       defbce on|off

       Same as the bce command except that the default setting for new windows
       is changed. Initial setting is `off'.

       defbreaktype [tcsendbreak|TIOCSBRK|TCSBRK]

       Choose  one  of  the available methods of generating a break signal for
       terminal devices. The preferred methods are tcsendbreak  and  TIOCSBRK.
       The  third, TCSBRK, blocks the complete screen session for the duration
       of the break, but it may be the  only  way  to  generate  long  breaks.
       Tcsendbreak and TIOCSBRK may or may not produce long breaks with spikes
       (e.g. 4 per second). This is not only system-dependent, this also  dif‐
       fers  between  serial  board  drivers.   Calling "defbreaktype" with no
       parameter displays the current setting.

       defcharset [set]

       Like the charset command except that the default setting for  new  win‐
       dows is changed. Shows current default if called without argument.

       defdynamictitle on|off

       Set default behaviour for new windows regarding if screen should change
       window title when seeing proper escape sequence. See also "TITLES (nam‐
       ing windows)" section.

       defescape xy

       Set  the default command characters. This is equivalent to the "escape"
       except that it is useful multiuser sessions only. In a  multiuser  ses‐
       sion  "escape" changes the command character of the calling user, where
       "defescape" changes the default command characters for users that  will
       be added later.

       defflow on|off|auto [interrupt]

       Same  as  the flow command except that the default setting for new win‐
       dows is changed. Initial setting is `auto'.  Specifying  "defflow  auto
       interrupt" is the same as the command-line options -fa and -i.

       defgr on|off

       Same  as the gr command except that the default setting for new windows
       is changed. Initial setting is `off'.

       defhstatus [status]

       The hardstatus line that all new windows will get  is  set  to  status.
       This  command  is useful to make the hardstatus of every window display
       the window number or title or the like.  Status may  contain  the  same
       directives  as in the window messages, but the directive escape charac‐
       ter is '^E' (octal 005) instead of '%'.  This was done to make a misin‐
       terpretation  of program generated hardstatus lines impossible.  If the
       parameter status is omitted, the current default string  is  displayed.
       Per default the hardstatus line of new windows is empty.

       defencoding enc

       Same  as  the  encoding command except that the default setting for new
       windows is changed. Initial setting is the encoding taken from the ter‐
       minal.

       deflog on|off

       Same as the log command except that the default setting for new windows
       is changed. Initial setting is `off'.

       deflogin on|off

       Same as the login command except that the default setting for new  win‐
       dows is changed. This is initialized with `on' as distributed (see con‐
       fig.h.in).

       defmode mode

       The mode of each newly allocated pseudo-tty is set to mode.  Mode is an
       octal number.  When no "defmode" command is given, mode 0622 is used.

       defmonitor on|off

       Same  as  the  monitor  command except that the default setting for new
       windows is changed. Initial setting is `off'.

       defmousetrack on|off

       Same as the mousetrack command except that the default setting for  new
       windows is changed. Initial setting is `off'.

       defnonblock on|off|numsecs

       Same  as  the nonblock command except that the default setting for dis‐
       plays is changed. Initial setting is `off'.

       defobuflimit limit

       Same as the obuflimit command except that the default setting  for  new
       displays  is  changed. Initial setting is 256 bytes.  Note that you can
       use the special 'OL' terminal capability if you want to have  a  depen‐
       dency on the terminal type.

       defscrollback num

       Same  as the scrollback command except that the default setting for new
       windows is changed. Initial setting is 100.

       defshell command

       Synonym to the shell .screenrc command. See there.

       defsilence on|off

       Same as the silence command except that the  default  setting  for  new
       windows is changed. Initial setting is `off'.

       defslowpaste msec

       Same  as  the slowpaste command except that the default setting for new
       windows is changed. Initial setting is 0 milliseconds, meaning `off'.

       defutf8 on|off

       Same as the utf8 command except that the default setting for  new  win‐
       dows  is  changed.  Initial  setting is `on' if screen was started with
       "-U", otherwise `off'.

       defwrap on|off

       Same as the wrap command except that the default setting for  new  win‐
       dows  is changed. Initially line-wrap is on and can be toggled with the
       "wrap" command ("C-a r") or by means of "C-a : wrap on|off".

       defwritelock on|off|auto

       Same as the writelock command except that the default setting  for  new
       windows is changed. Initially writelocks will off.

       detach [-h]

       Detach  the  screen session (disconnect it from the terminal and put it
       into the background).  This returns you to the shell where you  invoked
       screen.   A  detached screen can be resumed by invoking screen with the
       -r option (see also section  "COMMAND-LINE  OPTIONS").  The  -h  option
       tells  screen  to  immediately  close  the  connection  to the terminal
       ("hangup").

       dinfo

       Show what screen thinks about your terminal. Useful if you want to know
       why features like color or the alternate charset don't work.

       displays

       Shows  a  tabular  listing  of  all currently connected user front-ends
       (displays).  This is most useful for multiuser sessions.  The following
       keys can be used in displays list:

       tab(@); l l.  _ k, C-p, or up@Move up one line.  _ j, C-n, or down@Move
       down one line.  _ C-a or  home@Move  to  the  first  line.   _  C-e  or
       end@Move to the last line.  _ C-u or C-d@Move one half page up or down.
       _ C-b or C-f@Move one full page up or down.  _  mouseclick@T{  Move  to
       the  selected  line.  Available  when  "mousetrack" is set to on.  T} _
       space@Refresh the list _ d@Detach that display _  D@Power  detach  that
       display _ C-g, enter, or escape@Exit the list _

       The following is an example of what "displays" could look like:
              xterm 80x42 jnweiger@/dev/ttyp4     0(m11)   &rWx
              facit 80x24 mlschroe@/dev/ttyhf nb 11(tcsh)   rwx
              xterm 80x42 jnhollma@/dev/ttyp5     0(m11)   &R.x
               (A)   (B)     (C)     (D)     (E) (F)(G)   (H)(I)

       The legend is as follows:

              (A) The terminal type known by screen for this display.

              (B) Displays geometry as width x height.

              (C) Username who is logged in at the display.

              (D) Device name of the display or the attached device

              (E)  Display  is in blocking or nonblocking mode.  The available
              modes are "nb", "NB", "Z<", "Z>", and "BL".

              (F) Number of the window

              (G) Name/title of window

              (H) Whether the window is shared

              (I) Window permissions. Made up of three characters.

              allbox tab(:); csssss cs cs cs l l l l l l.  Window  permissions
              indicators   1st   character:2nd  character:3rd  character  -:no
              read:-:no write:-:no  execute  r:read:w:write:x:execute  ::W:own
              wlock::  lsssss  l  l  l  l l l.  Indicators of permissions sup‐
              pressed by a foreign wlock R:read only:.:no write::

              "displays" needs a region size of at least  10  characters  wide
              and 5 characters high in order to display.

       digraph [preset[unicode-value]]

       This  command  prompts  the  user  for a digraph sequence. The next two
       characters typed are looked up in a builtin  table  and  the  resulting
       character  is  inserted  in  the input stream. For example, if the user
       enters 'a"', an a-umlaut will  be  inserted.  If  the  first  character
       entered  is  a 0 (zero), screen will treat the following characters (up
       to three) as an octal number instead.  The optional argument preset  is
       treated  as user input, thus one can create an "umlaut" key.  For exam‐
       ple the command "bindkey ^K digraph '"'" enables the user  to  generate
       an a-umlaut by typing CTRL-K a.  When a non-zero unicode-value is spec‐
       ified, a new digraph is created with the specified preset. The  digraph
       is unset if a zero value is provided for the unicode-value.

       dumptermcap

       Write the termcap entry for the virtual terminal optimized for the cur‐
       rently  active  window  to  the   file   ".termcap"   in   the   user's
       "$HOME/.screen"  directory  (or wherever screen stores its sockets. See
       the "FILES" section below).  This termcap entry  is  identical  to  the
       value of the environment variable $TERMCAP that is set up by screen for
       each window. For terminfo based systems you will need  to  run  a  con‐
       verter like captoinfo and then compile the entry with tic.

       dynamictitle on|off

       Change  behaviour  for windows regarding if screen should change window
       title when seeing proper escape sequence. See also "TITLES (naming win‐
       dows)" section.

       echo [-n] message

       The  echo  command may be used to annoy screen users with a 'message of
       the day'. Typically installed in  a  global  /local/etc/screenrc.   The
       option  "-n"  may be used to suppress the line feed.  See also "sleep".
       Echo is also useful for online checking of environment variables.

       encoding enc [enc]

       Tell screen how to interpret the input/output. The first argument  sets
       the encoding of the current window. Each window can emulate a different
       encoding. The optional second parameter overwrites the encoding of  the
       connected terminal. It should never be needed as screen uses the locale
       setting to detect the encoding.  There is also a way to select a termi‐
       nal  encoding  depending on the terminal type by using the "KJ" termcap
       entry.

       Supported encodings are eucJP, SJIS, eucKR, eucCN, Big5,  GBK,  KOI8-R,
       KOI8-U,  CP1251,  UTF-8,  ISO8859-2,  ISO8859-3,  ISO8859-4, ISO8859-5,
       ISO8859-6, ISO8859-7,  ISO8859-8,  ISO8859-9,  ISO8859-10,  ISO8859-15,
       jis.

       See also "defencoding", which changes the default setting of a new win‐
       dow.

       escape xy

       Set the command character to x and the character generating  a  literal
       command  character  (by triggering the "meta" command) to y (similar to
       the -e option).  Each argument is either a  single  character,  a  two-
       character  sequence  of the form "^x" (meaning "C-x"), a backslash fol‐
       lowed by an octal number (specifying the ASCII code of the  character),
       or  a  backslash  followed by a second character, such as "\^" or "\\".
       The default is "^Aa".

       eval command1[command2 ...]

       Parses and executes each argument as separate command.

       exec [[fdpat]newcommand [args ...]]

       Run a unix subprocess (specified by an executable path  newcommand  and
       its optional arguments) in the current window. The flow of data between
       newcommands stdin/stdout/stderr, the process originally started in  the
       window  (let  us call it "application-process") and screen itself (win‐
       dow) is controlled by the file descriptor pattern fdpat.  This  pattern
       is  basically a three character sequence representing stdin, stdout and
       stderr of newcommand. A dot (.) connects the file descriptor to screen.
       An  exclamation  mark (!) causes the file descriptor to be connected to
       the application-process. A colon (:) combines both.  User input will go
       to  newcommand unless newcommand receives the application-process' out‐
       put (fdpats first character is `!' or `:') or  a  pipe  symbol  (|)  is
       added (as a fourth character) to the end of fdpat.

       Invoking  `exec' without arguments shows name and arguments of the cur‐
       rently running subprocess in this window. Only one  subprocess  a  time
       can be running in each window.

       When  a subprocess is running the `kill' command will affect it instead
       of the windows process.

       Refer to the postscript file `doc/fdpat.ps' for a  confusing  illustra‐
       tion  of  all  21  possible combinations. Each drawing shows the digits
       2,1,0 representing the three file descriptors of  newcommand.  The  box
       marked  `W'  is  the  usual pty that has the application-process on its
       slave side.  The box marked `P' is  the  secondary  pty  that  now  has
       screen at its master side.

       Abbreviations:  Whitespace  between  the  word `exec' and fdpat and the
       command can be omitted. Trailing dots and a fdpat  consisting  only  of
       dots can be omitted. A simple `|' is synonymous for the pattern `!..|';
       the word exec can be omitted here and can always be replaced by `!'.

       Examples:

              exec ... /bin/sh

              exec /bin/sh

              !/bin/sh

                     Creates another shell in the same window, while the orig‐
                     inal  shell  is  still  running. Output of both shells is
                     displayed and user input is sent to the new /bin/sh.

              exec !.. stty 19200

              exec ! stty 19200

              !!stty 19200

                     Set the speed of the window's tty. If your  stty  command
                     operates on stdout, then add another `!'.

              exec !..| less

              |less

                     This adds a pager to the window output. The special char‐
                     acter `|' is needed to give the  user  control  over  the
                     pager  although  it  gets  its  input  from  the window's
                     process. This works, because less listens  on  stderr  (a
                     behavior  that  screen  would not expect without the `|')
                     when its stdin is not a tty.  Less  versions  newer  than
                     177 fail miserably here; good old pg still works.

              !:sed -n s/.*Error.*/\007/p

                     Sends  window  output  to both, the user and the sed com‐
                     mand. The sed inserts an additional bell character  (oct.
                     007)  to  the  window  output  seen by screen.  This will
                     cause "Bell in window x" messages,  whenever  the  string
                     "Error" appears in the window.

       fit

       Change  the window size to the size of the current region. This command
       is needed because screen doesn't adapt the window size automatically if
       the window is displayed more than once.

       flow   [on|off|auto]

       Sets  the  flow-control  mode  for  this window.  Without parameters it
       cycles the current window's flow-control setting  from  "automatic"  to
       "on"  to  "off".  See the discussion on "FLOW-CONTROL" later on in this
       document for full details and note, that this is subject to  change  in
       future releases.  Default is set by `defflow'.

       focus [next|prev|up|down|left|right|top|bottom]

       Move  the  input focus to the next region. This is done in a cyclic way
       so that the top left region is selected after the bottom right one.  If
       no  option  is  given  it  defaults  to  `next'.  The next region to be
       selected is determined by how the regions are layered.   Normally,  the
       next region in the same layer would be selected.  However, if that next
       region contains one or more layers, the first  region  in  the  highest
       layer  is  selected first. If you are at the last region of the current
       layer, `next' will move the focus to the next region in the lower layer
       (if  there is a lower layer).  `Prev' cycles in the opposite order. See
       "split" for more information about layers.

       The rest of the options (`up',  `down',  `left',  `right',  `top',  and
       `bottom') are more indifferent to layers. The option `up' will move the
       focus upward to the region that is touching the upper  left  corner  of
       the  current  region.   `Down' will move downward to the region that is
       touching the lower left corner of the current region. The option `left'
       will  move  the focus leftward to the region that is touching the upper
       left corner of the current region, while `right' will move rightward to
       the  region  that  is  touching  the  upper right corner of the current
       region. Moving left from a left most region  or  moving  right  from  a
       right most region will result in no action.

       The  option  `top'  will move the focus to the very first region in the
       upper list corner of the screen, and `bottom' will move to  the  region
       in  the  bottom  right  corner of the screen. Moving up from a top most
       region or moving down from a bottom  most  region  will  result  in  no
       action.

       Useful bindings are (h, j, k, and l as in vi)
           bind h focus left
           bind j focus down
           bind k focus up
           bind l focus right
           bind t focus top
           bind b focus bottom
       Note that k is traditionally bound to the kill command.

       focusminsize [ ( width|max|_ ) ( height|max|_ ) ]

       This  forces  any currently selected region to be automatically resized
       at least a certain width and height. All other surrounding regions will
       be  resized in order to accommodate.  This constraint follows everytime
       the "focus" command is used.  The  "resize"  command  can  be  used  to
       increase either dimension of a region, but never below what is set with
       "focusminsize". The underscore `_' is a  synonym  for  max.  Setting  a
       width  and  height  of  `0 0' (zero zero) will undo any constraints and
       allow for manual resizing.  Without any parameters, the  minimum  width
       and height is shown.

       gr [on|off]

       Turn GR charset switching on/off. Whenever screen sees an input charac‐
       ter with the 8th bit set, it will use the charset stored in the GR slot
       and  print  the  character  with the 8th bit stripped. The default (see
       also "defgr") is not to process  GR  switching  because  otherwise  the
       ISO88591 charset would not work.

       group [grouptitle]

       Change  or show the group the current window belongs to. Windows can be
       moved around between different groups by specifying  the  name  of  the
       destination group. Without specifying a group, the title of the current
       group is displayed.

       hardcopy [-h] [file]

       Writes out the currently displayed image to the file file,  or,  if  no
       filename  is specified, to hardcopy.n in the default directory, where n
       is the number of the current window.  This either appends or overwrites
       the  file if it exists. See below.  If the option -h is specified, dump
       also the contents of the scrollback buffer.

       hardcopy_append on|off

       If set to "on", screen will append to the "hardcopy.n" files created by
       the  command  "C-a h", otherwise these files are overwritten each time.
       Default is `off'.

       hardcopydir directory

       Defines a directory where hardcopy files  will  be  placed.  If  unset,
       hardcopys are dumped in screen's current working directory.

       hardstatus [on|off]

       hardstatus [always]firstline|lastline|message|ignore[string]

       hardstatus string[string]

       This  command  configures the use and emulation of the terminal's hard‐
       status line. The first form toggles whether screen will use  the  hard‐
       ware  status  line  to  display  messages. If the flag is set to `off',
       these messages are overlaid in reverse video mode at the display  line.
       The default setting is `on'.

       The  second form tells screen what to do if the terminal doesn't have a
       hardstatus line (i.e. the  termcap/terminfo  capabilities  "hs",  "ts",
       "fs"  and "ds" are not set).  When "firstline/lastline" is used, screen
       will reserve the first/last line of the  display  for  the  hardstatus.
       "message"  uses  screen's  message  mechanism and "ignore" tells screen
       never to display the hardstatus.  If you prepend the word  "always"  to
       the type (e.g., "alwayslastline"), screen will use the type even if the
       terminal supports a hardstatus.

       The third form specifies the contents of the hardstatus line.  '%h'  is
       used as default string, i.e., the stored hardstatus of the current win‐
       dow (settable via "ESC]0;<string>^G"  or  "ESC_<string>ESC\")  is  dis‐
       played.   You  can  customize this to any string you like including the
       escapes from the "STRING ESCAPES" chapter. If you leave out  the  argu‐
       ment string, the current string is displayed.

       You  can mix the second and third form by providing the string as addi‐
       tional argument.

       height [-w|-d] [lines [cols]]

       Set the display height to a specified number of lines. When no argument
       is given it toggles between 24 and 42 lines display. You can also spec‐
       ify a width if you want to change both values.   The  -w  option  tells
       screen  to  leave  the  display  size unchanged and just set the window
       size, -d vice versa.

       help[class]

       Not really a online help, but displays a help screen  showing  you  all
       the  key bindings.  The first pages list all the internal commands fol‐
       lowed by their current bindings.  Subsequent  pages  will  display  the
       custom  commands,  one  command  per key.  Press space when you're done
       reading each page, or return to exit early.  All other  characters  are
       ignored.  If  the  "-c" option is given, display all bound commands for
       the specified command class.  See also "DEFAULT KEY BINDINGS" section.

       history

       Usually users work with a shell that allows  easy  access  to  previous
       commands.  For example csh has the command "!!" to repeat the last com‐
       mand executed.  Screen allows you to have a primitive way of re-calling
       "the  command that started ...": You just type the first letter of that
       command, then hit `C-a {' and screen tries to find a previous line that
       matches  with  the  `prompt  character' to the left of the cursor. This
       line is pasted into this window's input queue.  Thus you have  a  crude
       command  history (made up by the visible window and its scrollback buf‐
       fer).

       hstatus status

       Change the window's hardstatus line to the string status.

       idle [timeout[cmd-args]]

       Sets a command that is run after the specified number of seconds  inac‐
       tivity  is reached. This command will normally be the "blanker" command
       to create a screen blanker, but it can be any screen  command.   If  no
       command  is  specified,  only the timeout is set. A timeout of zero (or
       the special timeout off) disables  the  timer.   If  no  arguments  are
       given, the current settings are displayed.

       ignorecase [on|off]

       Tell  screen  to  ignore the case of characters in searches. Default is
       `off'. Without any options, the state of ignorecase is toggled.

       info

       Uses the message line to display some  information  about  the  current
       window:  the  cursor  position in the form "(column,row)" starting with
       "(1,1)", the terminal width and height plus the size of the  scrollback
       buffer  in  lines,  like  in  "(80,24)+50", the current state of window
       XON/XOFF flow control is shown like this (See also  section  FLOW  CON‐
       TROL):

       allbox  tab(@);  l  l.   +flow@automatic  flow  control,  currently on.
       -flow@automatic flow control,  currently  off.   +(+)flow@flow  control
       enabled.  Agrees  with  automatic  control.  -(+)flow@flow control dis‐
       abled.  Disagrees  with  automatic  control.    +(-)flow@flow   control
       enabled.  Disagrees with automatic control.  -(-)flow@flow control dis‐
       abled. Agrees with automatic control.

       The current line wrap setting (`+wrap' indicates enabled, `-wrap'  not)
       is  also  shown. The flags `ins', `org', `app', `log', `mon' or `nored'
       are displayed when the window is in insert mode, origin mode,  applica‐
       tion-keypad  mode,  has  output logging, activity monitoring or partial
       redraw enabled.

       The currently active character set (G0, G1, G2, or G3)  and  in  square
       brackets  the  terminal character sets that are currently designated as
       G0 through G3 is shown. If the window is  in  UTF-8  mode,  the  string
       "UTF-8" is shown instead.

       Additional  modes  depending on the type of the window are displayed at
       the end of the status line (See also chapter "WINDOW TYPES").

       If the state machine of the  terminal  emulator  is  in  a  non-default
       state,  the  info line is started with a string identifying the current
       state.

       For system information use the "time" command.

       ins_reg [key]

       No longer exists, use "paste" instead.

       kill

       Kill current window.

       If there is an `exec' command running then it is killed. Otherwise  the
       process  (shell) running in the window receives a HANGUP condition, the
       window structure is removed  and  screen  (your  display)  switches  to
       another  window.   When  the  last  window  is destroyed, screen exits.
       After a kill screen switches to the previously displayed window.

       Note: Emacs users should keep this command  in  mind,  when  killing  a
       line.   It  is recommended not to use "C-a" as the screen escape key or
       to rebind kill to "C-a K".

       lastmsg

       Redisplay the last contents of  the  message/status  line.   Useful  if
       you're  typing  when  a message appears, because  the message goes away
       when you press a key (unless your terminal has a hardware status line).
       Refer to the commands "msgwait" and "msgminwait" for fine tuning.

       layout new [title]

       Create  a new layout. The screen will change to one whole region and be
       switched to the blank window. From here, you build the regions and  the
       windows  they  show as you desire. The new layout will be numbered with
       the smallest available integer, starting with zero. You can  optionally
       give  a  title  to  your new layout.  Otherwise, it will have a default
       title of "layout". You can always change the title later by  using  the
       command layout title.

       layout remove [n|title]

       Remove, or in other words, delete the specified layout. Either the num‐
       ber or the title can be specified. Without either specification, screen
       will remove the current layout.

       Removing a layout does not affect your set windows or regions.

       layout next

       Switch to the next layout available

       layout prev

       Switch to the previous layout available

       layout select [n|title]

       Select the desired layout. Either the number or the title can be speci‐
       fied. Without either specification, screen will prompt  and  ask  which
       screen  is  desired. To see which layouts are available, use the layout
       show command.

       layout show

       List on the message line the number(s) and title(s)  of  the  available
       layout(s). The current layout is flagged.

       layout title [title]

       Change  or display the title of the current layout. A string given will
       be used to name the layout. Without any options, the current title  and
       number is displayed on the message line.

       layout number [n]

       Change  or  display  the number of the current layout. An integer given
       will be used to number the layout. Without  any  options,  the  current
       number and title is displayed on the message line.

       layout attach [title|:last]

       Change  or  display  which  layout  to reattach back to. The default is
       :last, which tells screen to reattach back to the last used layout just
       before  detachment.  By  supplying  a title, You can instruct screen to
       reattach to a particular layout regardless which one was  used  at  the
       time of detachment. Without any options, the layout to reattach to will
       be shown in the message line.

       layout save [n|title]

       Remember the current arrangement of regions.  When  used,  screen  will
       remember  the arrangement of vertically and horizontally split regions.
       This arrangement is restored when a screen  session  is  reattached  or
       switched  back  from  a  different  layout.  If the session ends or the
       screen process dies, the layout arrangements are lost. The layout  dump
       command  should  help  in  this siutation. If a number or title is sup‐
       plied, screen will remember the arrangement of that particular  layout.
       Without any options, screen will remember the current layout.

       Saving  your  regions  can  be  done  automatically by using the layout
       autosave command.

       layout autosave [on|off]

       Change or display  the  status  of  automatcally  saving  layouts.  The
       default  is on, meaning when screen is detached or changed to a differ‐
       ent layout, the arrangement of regions and windows will  be  remembered
       at  the time of change and restored upon return.  If autosave is set to
       off, that arrangement will only be restored to either to the last  man‐
       ual  save,  using layout save, or to when the layout was first created,
       to a single region with a single window. Without either an on  or  off,
       the current status is displayed on the message line.

       layout dump [filename]

       Write to a file the order of splits made in the current layout. This is
       useful to recreate the order of your regions used in your current  lay‐
       out.  Only  the  current  layout  is  recorded.  While the order of the
       regions are recorded, the sizes of those regions and which windows cor‐
       respond  to  which  regions  are  not. If no filename is specified, the
       default is layout-dump, saved in the directory that the screen  process
       was  started in. If the file already exists, layout dump will append to
       that file. As an example:

                   C-a : layout dump /home/user/.screenrc

       will save or append the layout to the user's .screenrc file.

       license

       Display the disclaimer page. This is done whenever  screen  is  started
       without   options,   which   should  be  often  enough.  See  also  the
       "startup_message" command.

       lockscreen

       Lock this  display.   Call  a  screenlock  program  (/local/bin/lck  or
       /usr/bin/lock  or  a builtin if no other is available). Screen does not
       accept any command keys until this program terminates.  Meanwhile  pro‐
       cesses  in  the  windows  may  continue,  as  the  windows  are  in the
       `detached' state. The screenlock program may  be  changed  through  the
       environment  variable  $LOCKPRG  (which  must  be set in the shell from
       which screen is started) and is executed with the user's uid and gid.

       Warning: When you leave other shells unlocked and you have no  password
       set  on  screen,  the  lock is void: One could easily re-attach from an
       unlocked shell. This feature should rather be called `lockterminal'.

       log [on|off]

       Start/stop writing output of the current window to a file "screenlog.n"
       in the window's default directory, where n is the number of the current
       window. This filename can be changed with the `logfile' command. If  no
       parameter is given, the state of logging is toggled. The session log is
       appended to the previous contents of the file if it already exists. The
       current  contents  and  the  contents of the scrollback history are not
       included in the session log.  Default is `off'.

       logfile filename

       logfile flush secs

       Defines the name the log files will get. The default is "screenlog.%n".
       The  second  form changes the number of seconds screen will wait before
       flushing the logfile buffer to the file-system. The default value is 10
       seconds.

       login [on|off]

       Adds  or  removes  the  entry in the utmp database file for the current
       window.  This controls if the window is `logged in'.  When no parameter
       is  given,  the  login state of the window is toggled.  Additionally to
       that toggle, it is convenient having a `log in' and a  `log  out'  key.
       E.g. `bind I login on' and `bind O login off' will map these keys to be
       C-a I and C-a O.  The default setting (in config.h.in) should  be  "on"
       for  a screen that runs under suid-root.  Use the "deflogin" command to
       change the default login state for new windows. Both commands are  only
       present when screen has been compiled with utmp support.

       logtstamp [on|off]

       logtstamp after [secs]

       logtstamp string
       [string]

       This command controls logfile time-stamp mechanism of screen.  If time-
       stamps are turned "on", screen adds a  string  containing  the  current
       time  to the logfile after two minutes of inactivity.  When output con‐
       tinues and more than another two minutes have passed,  a  second  time-
       stamp  is  added  to document the restart of the output. You can change
       this timeout with the second form of the command.  The  third  form  is
       used  for customizing the time-stamp string (`-- %n:%t -- time-stamp --
       %M/%d/%y %c:%s --\n' by default).

       mapdefault

       Tell screen that the next input character should only be looked  up  in
       the default bindkey table. See also "bindkey".

       mapnotnext

       Like mapdefault, but don't even look in the default bindkey table.

       maptimeout [timeout]

       Set the inter-character timer for input sequence detection to a timeout
       of timeout ms. The default timeout is 300ms. Maptimeout with  no  argu‐
       ments shows the current setting.  See also "bindkey".

       markkeys string

       This  is  a  method  of changing the keymap used for copy/history mode.
       The string is made up of oldchar=newchar pairs which are  separated  by
       `:'. Example: The string "B=^B:F=^F" will change the keys `C-b' and `C-
       f' to the vi style binding (scroll up/down fill page).  This happens to
       be  the  default  binding  for  `B'  and  `F'.   The  command "markkeys
       h=^B:l=^F:$=^E" would set the mode for an emacs-style binding.  If your
       terminal sends characters, that cause you to abort copy mode, then this
       command may help by binding these characters to do nothing.  The  no-op
       character  is `@' and is used like this: "markkeys @=L=H" if you do not
       want to use the `H' or `L' commands any longer.  As shown in this exam‐
       ple,  multiple  keys can be assigned to one function in a single state‐
       ment.

       maxwin num

       Set the maximum  window  number  screen  will  create.  Doesn't  affect
       already  existing  windows. The number can be increased only when there
       are no existing windows.

       meta

       Insert the command  character  (C-a)  in  the  current  window's  input
       stream.

       monitor [on|off]

       Toggles  activity  monitoring of windows.  When monitoring is turned on
       and an affected window  is  switched  into  the  background,  you  will
       receive  the  activity  notification  message in the status line at the
       first sign of output and the window will also be marked with an `@'  in
       the  window-status  display.   Monitoring is initially off for all win‐
       dows.

       mousetrack [on|off]

       This command determines whether screen will  watch  for  mouse  clicks.
       When  this  command is enabled, regions that have been split in various
       ways can be selected by pointing to them with a mouse and left-clicking
       them. Without specifying on or off, the current state is displayed. The
       default state is determined by the "defmousetrack" command.

       msgminwait sec

       Defines the time screen delays a new message when one message  is  cur‐
       rently displayed.  The default is 1 second.

       msgwait sec

       Defines  the  time a message is displayed if screen is not disturbed by
       other activity. The default is 5 seconds.

       multiuser on|off

       Switch between singleuser and multiuser mode. Standard screen operation
       is  singleuser.  In  multiuser  mode  the  commands `acladd', `aclchg',
       `aclgrp' and `acldel' can be used to enable (and disable)  other  users
       accessing this screen session.

       nethack on|off

       Changes the kind of error messages used by screen.  When you are famil‐
       iar with the game "nethack", you may enjoy the  nethack-style  messages
       which will often blur the facts a little, but are much funnier to read.
       Anyway, standard messages often tend to be unclear as well.
       This option is only available if screen was compiled with  the  NETHACK
       flag defined. The default setting is then determined by the presence of
       the environment variable $NETHACKOPTIONS and the file ~/.nethackrc - if
       either one is present, the default is on.

       next

       Switch  to  the  next  window.   This command can be used repeatedly to
       cycle through the list of windows.

       nonblock [on|off|numsecs]

       Tell screen how to deal with user interfaces (displays) that  cease  to
       accept output. This can happen if a user presses ^S or a TCP/modem con‐
       nection gets cut but no hangup is received. If nonblock is off (this is
       the default) screen waits until the display restarts to accept the out‐
       put. If nonblock is on, screen waits until the timeout is  reached  (on
       is  treated  as  1s).  If the display still doesn't receive characters,
       screen will consider it "blocked" and stop sending characters to it. If
       at  some time it restarts to accept characters, screen will unblock the
       display and redisplay the updated window contents.

       number [[+|-]n]

       Change the current window's number. If the given number  n  is  already
       used  by  another  window,  both  windows exchange their numbers. If no
       argument is specified, the current window number (and title) is  shown.
       Using `+' or `-' will change the window's number by the relative amount
       specified.

       obuflimit [limit]

       If the output buffer contains more bytes than the specified  limit,  no
       more  data  will be read from the windows. The default value is 256. If
       you have a fast display (like xterm), you can set  it  to  some  higher
       value. If no argument is specified, the current setting is displayed.

       only

       Kill all regions but the current one.

       other

       Switch  to  the  window  displayed  previously.  If this window does no
       longer exist, other has the same effect as next.

       partial on|off

       Defines whether the display should be  refreshed  (as  with  redisplay)
       after  switching  to  the current window. This command only affects the
       current window.  To immediately affect all windows use  the  allpartial
       command.  Default is `off', of course.  This default is fixed, as there
       is currently no defpartial command.

       password [crypted_pw]

       Present a crypted password in your ".screenrc" file and screen will ask
       for  it, whenever someone attempts to resume a detached. This is useful
       if you have privileged programs running under screen and  you  want  to
       protect  your session from reattach attempts by another user masquerad‐
       ing as your uid (i.e. any superuser.)  If no crypted password is speci‐
       fied, screen prompts twice for typing a password and places its encryp‐
       tion in the paste buffer.  Default is `none',  this  disables  password
       checking.

       paste [registers [dest_reg]]

       Write  the  (concatenated)  contents  of the specified registers to the
       stdin queue of the current window. The register '.' is treated  as  the
       paste  buffer. If no parameter is given the user is prompted for a sin‐
       gle register to paste.  The paste buffer can be filled with  the  copy,
       history  and  readbuf commands.  Other registers can be filled with the
       register, readreg and paste commands.  If paste is called with a second
       argument,  the  contents  of the specified registers is pasted into the
       named destination register rather than the window. If '.'  is  used  as
       the  second  argument,  the  displays  paste buffer is the destination.
       Note, that "paste" uses a wide variety of resources: Whenever a  second
       argument  is  specified  no  current  window is needed. When the source
       specification only contains registers (not the paste buffer) then there
       need not be a current display (terminal attached), as the registers are
       a global resource. The paste buffer exists once for every user.

       pastefont [on|off]

       Tell screen to include  font  information  in  the  paste  buffer.  The
       default  is  not  to do so. This command is especially useful for multi
       character fonts like kanji.

       pow_break

       Reopen the window's terminal line  and  send  a  break  condition.  See
       `break'.

       pow_detach

       Power  detach.  Mainly the same as detach, but also sends a HANGUP sig‐
       nal to the parent process of screen.  CAUTION: This will  result  in  a
       logout, when screen was started from your login-shell.

       pow_detach_msg [message]

       The message specified here is output whenever a `Power detach' was per‐
       formed. It may be used as a replacement for  a  logout  message  or  to
       reset baud rate, etc.  Without parameter, the current message is shown.

       prev

       Switch  to  the window with the next lower number.  This command can be
       used repeatedly to cycle through the list of windows.

       printcmd [cmd]

       If cmd is not an empty string, screen will not use the  terminal  capa‐
       bilities  "po/pf"  if  it detects an ansi print sequence ESC [ 5 i, but
       pipe the output into cmd.  This should normally be a command like "lpr"
       or  "'cat  >  /tmp/scrprint'".  printcmd without a command displays the
       current setting.  The ansi sequence ESC \ ends printing and closes  the
       pipe.

       Warning:  Be careful with this command! If other user have write access
       to your terminal, they will be able to fire off print commands.

       process [key]

       Stuff the contents of the specified register into screen's input queue.
       If  no argument is given you are prompted for a register name. The text
       is parsed as if it had been typed in from  the  user's  keyboard.  This
       command can be used to bind multiple actions to a single key.

       quit

       Kill all windows and terminate screen.  Note that on VT100-style termi‐
       nals the keys C-4 and C-\ are identical.  This makes the default  bind‐
       ings  dangerous:  Be  careful not to type C-a C-4 when selecting window
       no. 4.  Use the empty bind command (as in "bind '^\'") to remove a  key
       binding.

       readbuf [encoding] [filename]

       Reads  the  contents  of the specified file into the paste buffer.  You
       can tell screen the encoding of the file via the -e option.  If no file
       is  specified, the screen-exchange filename is used.  See also "buffer‐
       file" command.

       readreg [encoding] [register [filename]]

       Does one of two things, dependent on number of arguments: with zero  or
       one arguments it duplicates the paste buffer contents into the register
       specified or entered at the prompt. With two  arguments  it  reads  the
       contents of the named file into the register, just as readbuf reads the
       screen-exchange file into the paste buffer.  You can  tell  screen  the
       encoding  of  the  file  via the -e option.  The following example will
       paste the system's password file into the screen window (using register
       p, where a copy remains):

                   C-a : readreg p /etc/passwd
                   C-a : paste p

       redisplay

       Redisplay  the  current  window. Needed to get a full redisplay when in
       partial redraw mode.

       register [-eencoding]key-string

       Save the specified string to the register key.   The  encoding  of  the
       string  can  be specified via the -e option.  See also the "paste" com‐
       mand.

       remove

       Kill the current region. This is a no-op if there is only one region.

       removebuf

       Unlinks the screen-exchange file used by the  commands  "writebuf"  and
       "readbuf".

       rendition bell | monitor | silence | so  attr  [ color ]

       Change  the  way screen renders the titles of windows that have monitor
       or bell flags set in caption  or  hardstatus  or  windowlist.  See  the
       "STRING  ESCAPES" chapter for the syntax of the modifiers.  The default
       for monitor is currently "=b " (bold, active colors), for bell  "=ub  "
       (underline, bold and active colors), and "=u " for silence.

       reset

       Reset  the  virtual  terminal  to  its  "power-on"  values. Useful when
       strange settings (like scroll regions or graphics  character  set)  are
       left over from an application.

       resize [-h|-v|-b|-l|-p] [[+|-] n[%] |=|max|min|_|0]

       Resize  the  current region. The space will be removed from or added to
       the surrounding regions depending on the  order  of  the  splits.   The
       available  options  for  resizing are `-h'(horizontal), `-v'(vertical),
       `-b'(both), `-l'(local to layer), and  `-p'(perpendicular).  Horizontal
       resizes  will  add  or  remove  width to a region, vertical will add or
       remove height, and both will add or remove size from  both  dimensions.
       Local  and  perpendicular  are  similar to horizontal and vertical, but
       they take in account of how a region was split.   If  a  region's  last
       split  was horizontal, a local resize will work like a vertical resize.
       If a region's last split was vertical, a local resize will work like  a
       horizontal  resize.  Perpendicular  resizes  work  in opposite of local
       resizes. If no option is specified, local is the default.

       The amount of lines to add or remove can be expressed a couple of  dif‐
       ferent  ways. By specifying a number n by itself will resize the region
       by that absolute amount. You can specify a relative amount by prefixing
       a  plus  `+'  or  minus  `-'  to the amount, such as adding +n lines or
       removing -n lines. Resizing can also be expressed  as  an  absolute  or
       relative percentage by postfixing a percent sign `%'. Using zero `0' is
       a synonym for `min' and using an underscore `_' is a synonym for `max'.

       Some examples are:

       resize +N
              increase current region by N

       resize -N
              decrease current region by N

       resize  N
              set current region to N

       resize 20%
              set current region to 20% of original size

       resize +20%
              increase current region by 20%

       resize -b =
              make all windows equally

       resize  max
              maximize current region

       resize  min
              minimize current region

       Without any arguments, screen will prompt for how  you  would  like  to
       resize the current region.

       See  "focusminsize"  if  you want to restrict the minimun size a region
       can have.

       screen [-opts] [n] [cmd [args]|//group]

       Establish a new window.  The flow-control options (-f,  -fn  and  -fa),
       title  (a.k.a.) option (-t), login options (-l and -ln) , terminal type
       option (-T <term>), the all-capability-flag (-a) and scrollback  option
       (-h  <num>)  may be specified with each command.  The option (-M) turns
       monitoring on for this window.  The option (-L) turns output logging on
       for  this  window.  If an optional number n in the range 0..MAXWIN-1 is
       given, the window number n is assigned to the newly created window (or,
       if  this  number  is  already in-use, the next available number).  If a
       command is specified after "screen", this command (with the given argu‐
       ments)  is  started  in  the window; otherwise, a shell is created.  If
       //group is supplied, a container-type window is created in which  other
       windows may be created inside it.

       Thus, if your ".screenrc" contains the lines

                   # example for .screenrc:
                   screen 1
                   screen -fn -t foobar -L 2 telnet foobar

       screen creates a shell window (in window #1) and a window with a TELNET
       connection to the machine foobar (with no flow-control using the  title
       "foobar"  in window #2) and will write a logfile ("screenlog.2") of the
       telnet session.  Note, that unlike previous versions of screen no addi‐
       tional default window is created when "screen" commands are included in
       your ".screenrc" file. When the  initialization  is  completed,  screen
       switches  to  the  last  window specified in your .screenrc file or, if
       none, opens a default window #0.

       Screen has built in some functionality of "cu" and "telnet".  See  also
       chapter "WINDOW TYPES".

       scrollback num

       Set  the  size  of the scrollback buffer for the current windows to num
       lines. The default scrollback is 100 lines.  See also  the  "defscroll‐
       back" command and use "info" to view the current setting. To access and
       use the contents in the scrollback buffer, use the "copy" command.

       select [WindowID]

       Switch to the window identified by WindowID.  This can be a prefix of a
       window title (alphanumeric window name) or a window number.  The param‐
       eter is optional and if omitted, you get prompted  for  an  identifier.
       When  a  new  window  is  established,  the  first  available number is
       assigned to this window.  Thus, the first window can  be  activated  by
       "select  0".   The  number of windows is limited at compile-time by the
       MAXWIN configuration parameter (which defaults to 40).  There  are  two
       special  WindowIDs,  "-"  selects  the  internal  blank  window and "."
       selects the current window. The latter is useful if used with  screen's
       "-X" option.

       sessionname [name]

       Rename  the  current  session.  Note,  that for "screen -list" the name
       shows up with the process-id prepended. If the argument "name" is omit‐
       ted,  the name of this session is displayed. Caution: The $STY environ‐
       ment variables will still reflect the old name in pre-existing  shells.
       This may result in confusion. Use of this command is generally discour‐
       aged. Use the "-S" command-line option if you want to name a  new  ses‐
       sion.  The default is constructed from the tty and host names.

       setenv [var [string]]

       Set the environment variable var to value string.  If only var is spec‐
       ified, the user will be prompted to enter a value.   If  no  parameters
       are  specified,  the user will be prompted for both variable and value.
       The environment is inherited by all subsequently forked shells.

       setsid [on|off]

       Normally screen uses different sessions and process groups for the win‐
       dows. If setsid is turned off, this is not done anymore and all windows
       will be in the same process group as the screen backend  process.  This
       also  breaks job-control, so be careful.  The default is on, of course.
       This command is probably useful only in rare circumstances.

       shell command

       Set the command to be used to create a new shell.  This  overrides  the
       value of the environment variable $SHELL.  This is useful if you'd like
       to run a tty-enhancer which is expecting to execute the program  speci‐
       fied  in $SHELL.  If the command begins with a '-' character, the shell
       will be started as a login-shell. Typical shells do only  minimal  ini‐
       tialization when not started as a login-shell.  E.g. Bash will not read
       your "~/.bashrc" unless it is a login-shell.

       shelltitle title

       Set the title for all shells created during startup or by the  C-A  C-c
       command.   For  details about what a title is, see the discussion enti‐
       tled "TITLES (naming windows)".

       silence [on|off|sec]

       Toggles silence monitoring of windows.  When silence is turned  on  and
       an  affected  window  is switched into the background, you will receive
       the silence notification message in the status line after  a  specified
       period of inactivity (silence). The default timeout can be changed with
       the `silencewait' command or by specifying a number of seconds  instead
       of `on' or `off'.  Silence is initially off for all windows.

       silencewait sec

       Define  the  time  that  all  windows monitored for silence should wait
       before displaying a message. Default 30 seconds.

       sleep num

       This command will pause the execution of a .screenrc file for num  sec‐
       onds.   Keyboard  activity  will end the sleep.  It may be used to give
       users a chance to read the messages output by "echo".

       slowpaste msec

       Define the speed at which text is inserted into the current  window  by
       the paste ("C-a ]") command.  If the slowpaste value is nonzero text is
       written character by character.  screen will make a pause of msec  mil‐
       liseconds after each single character write to allow the application to
       process its input. Only use slowpaste if your underlying system exposes
       flow control problems while pasting large amounts of text.

       sort

       Sort the windows in alphabetical order of the window tiles.

       source file

       Read and execute commands from file file. Source commands may be nested
       to a maximum recursion level of ten. If file is not  an  absolute  path
       and screen is already processing a source command, the parent directory
       of the running source command file is used to search for the  new  com‐
       mand file before screen's current directory.

       Note  that  termcap/terminfo/termcapinfo  commands only work at startup
       and reattach time, so they must be reached  via  the  default  screenrc
       files to have an effect.

       sorendition [attr[color]]

       This command is deprecated. See "rendition so" instead.

       split[-v]

       Split  the current region into two new ones. All regions on the display
       are resized to make room for the new region. The blank window  is  dis‐
       played  in the new region. The default is to create a horizontal split,
       putting the new regions on the top and bottom of each other. Using `-v'
       will create a vertical split, causing the new regions to appear side by
       side of each other.  Use the "remove" or the "only" command  to  delete
       regions.  Use "focus" to toggle between regions.

       When  a  region  is split opposite of how it was previously split (that
       is, vertical then horizontal or horizontal then vertical), a new  layer
       is  created.  The  layer is used to group together the regions that are
       split the same. Normally, as a user, you should not  see  nor  have  to
       worry about layers, but they will affect how some commands ("focus" and
       "resize") behave.

       With this current implementation of screen, scrolling data will  appear
       much  slower  in  a  vertically split region than one that is not. This
       should be taken into consideration if you need to use  system  commands
       such as "cat" or "tail -f".

       startup_message on|off

       Select  whether  you  want  to see the copyright notice during startup.
       Default is `on', as you probably noticed.

       status [top|up|down|bottom] [left|right]

       The status window by default is in bottom-left corner. This command can
       move  status  messages  to any corner of the screen. top is the same as
       up, down is the same as bottom.

       stuff [string]

       Stuff the string string in the input  buffer  of  the  current  window.
       This  is like the "paste" command but with much less overhead.  Without
       a parameter, screen will prompt for a  string  to  stuff.   You  cannot
       paste large buffers with the "stuff" command. It is most useful for key
       bindings. See also "bindkey".

       su [username [password [password2]]]

       Substitute the user of a display. The command prompts for  all  parame‐
       ters  that  are omitted. If passwords are specified as parameters, they
       have to be specified un-crypted. The first password is matched  against
       the systems passwd database, the second password is matched against the
       screen password as set with the commands "acladd" or "password".   "Su"
       may  be  useful  for the screen administrator to test multiuser setups.
       When the identification fails, the user  has  access  to  the  commands
       available  for  user nobody.  These are "detach", "license", "version",
       "help" and "displays".

       suspend

       Suspend screen.  The windows are in the `detached' state, while  screen
       is  suspended.  This  feature  relies on the shell being able to do job
       control.

       term term

       In each window's environment screen opens, the $TERM variable is set to
       "screen" by default.  But when no description for "screen" is installed
       in the local termcap or terminfo data base, you set $TERM to  -  say  -
       "vt100".  This  won't do much harm, as screen is VT100/ANSI compatible.
       The use of the "term" command is discouraged for  non-default  purpose.
       That  is,  one  may want to specify special $TERM settings (e.g. vt100)
       for the next "screen rlogin  othermachine"  command.  Use  the  command
       "screen -T vt100 rlogin othermachine" rather than setting and resetting
       the default.

       termcap term terminal-tweaks[window-tweaks]

       terminfo term terminal-tweaks[window-tweaks]

       termcapinfo term terminal-tweaks[window-tweaks]

       Use this command to modify your terminal's termcap entry without  going
       through  all  the  hassles involved in creating a custom termcap entry.
       Plus, you can optionally customize the termcap generated for  the  win‐
       dows.   You have to place these commands in one of the screenrc startup
       files, as they are meaningless once the terminal emulator is booted.

       If your system uses the terminfo database rather than  termcap,  screen
       will  understand  the `terminfo' command, which has the same effects as
       the `termcap' command.  Two separate commands are  provided,  as  there
       are  subtle  syntactic  differences,  e.g. when parameter interpolation
       (using `%') is required. Note that termcap names  of  the  capabilities
       have to be used with the `terminfo' command.

       In many cases, where the arguments are valid in both terminfo and term‐
       cap syntax, you can use the command  `termcapinfo',  which  is  just  a
       shorthand  for a pair of `termcap' and `terminfo' commands with identi‐
       cal arguments.

       The first argument specifies which terminal(s) should  be  affected  by
       this definition.  You can specify multiple terminal names by separating
       them with `|'s.  Use `*' to match all terminals and `vt*' to match  all
       terminals that begin with "vt".

       Each  tweak argument contains one or more termcap defines (separated by
       `:'s) to be inserted at the start of  the  appropriate  termcap  entry,
       enhancing  it  or overriding existing values.  The first tweak modifies
       your terminal's termcap, and contains definitions  that  your  terminal
       uses to perform certain functions.  Specify a null string to leave this
       unchanged (e.g. '').  The second (optional) tweak modifies all the win‐
       dow  termcaps,  and  should contain definitions that screen understands
       (see the "VIRTUAL TERMINAL" section).

       Some examples:

              termcap xterm*  LP:hs@

       Informs screen that all terminals that begin  with  `xterm'  have  firm
       auto-margins  that  allow the last position on the screen to be updated
       (LP), but they don't really have a status line (no 'hs' - append `@' to
       turn  entries  off).   Note  that we assume `LP' for all terminal names
       that start with "vt", but only if you don't specify a  termcap  command
       for that terminal.
              termcap vt*  LP

       termcap vt102|vt220  Z0=\E[?3h:Z1=\E[?3l

       Specifies  the  firm-margined  `LP'  capability  for all terminals that
       begin with `vt', and the second line will also add the escape-sequences
       to switch into (Z0) and back out of (Z1) 132-character-per-line mode if
       this is a VT102 or VT220.  (You must specify Z0 and Z1 in your  termcap
       to use the width-changing commands.)

              termcap vt100  ""  l0=PF1:l1=PF2:l2=PF3:l3=PF4

       This  leaves  your vt100 termcap alone and adds the function key labels
       to each window's termcap entry.

              termcap h19|z19  am@:im=\E@:ei=\EO  dc=\E[P

       Takes a h19 or z19 termcap and turns off auto-margins (am@) and enables
       the  insert  mode (im) and end-insert (ei) capabilities (the `@' in the
       `im' string is after the `=', so it is part of the string).  Having the
       `im'  and  `ei' definitions put into your terminal's termcap will cause
       screen to automatically advertise the  character-insert  capability  in
       each  window's termcap.  Each window will also get the delete-character
       capability (dc) added to its termcap, which screen will translate  into
       a  line-update  for  the  terminal (we're pretending it doesn't support
       character deletion).

       If you would like to fully specify each  window's  termcap  entry,  you
       should  instead  set  the  $SCREENCAP variable prior to running screen.
       See the discussion on the "VIRTUAL TERMINAL" in this  manual,  and  the
       termcap(5) man page for more information on termcap definitions.

       time   [string]

       Uses  the  message  line to display the time of day, the host name, and
       the load averages over 1, 5, and 15 minutes (if this  is  available  on
       your system).  For window specific information, use "info".

       If a string is specified, it changes the format of the time report like
       it is described in the "STRING ESCAPES" chapter. Screen uses a  default
       of "%c:%s %M %d %H%? %l%?".

       title [windowtitle]

       Set the name of the current window to windowtitle. If no name is speci‐
       fied, screen prompts for one. This command was known as `aka' in previ‐
       ous releases.

       unbindall

       Unbind  all the bindings. This can be useful when screen is used solely
       for its detaching abilities, such as when letting a console application
       run  as a daemon. If, for some reason, it is necessary to bind commands
       after this, use 'screen -X'.

       unsetenv var

       Unset an environment variable.

       utf8 [on|off[on|off]]

       Change the encoding used in the current window. If utf8 is enabled, the
       strings  sent to the window will be UTF-8 encoded and vice versa. Omit‐
       ting the parameter toggles the setting. If a second parameter is given,
       the display's encoding is also changed (this should rather be done with
       screen's "-U" option).  See also "defutf8", which changes  the  default
       setting of a new window.

       vbell [on|off]

       Sets  the  visual  bell setting for this window. Omitting the parameter
       toggles the setting. If vbell is switched on, but  your  terminal  does
       not support a visual bell, a `vbell-message' is displayed in the status
       line when the bell character (^G) is received.  Visual bell support  of
       a terminal is defined by the termcap variable `vb' (terminfo: 'flash').

       Per  default,  vbell  is  off, thus the audible bell is used.  See also
       `bell_msg'.

       vbell_msg [message]

       Sets the visual bell message. message is printed to the status line  if
       the  window  receives  a bell character (^G), vbell is set to "on", but
       the terminal does not support a visual bell.  The  default  message  is
       "Wuff, Wuff!!".  Without a parameter, the current message is shown.

       vbellwait sec

       Define  a  delay  in seconds after each display of screen's visual bell
       message. The default is 1 second.

       verbose [on|off]

       If verbose is switched on, the command name is echoed, whenever a  win‐
       dow  is  created  (or  resurrected  from zombie state). Default is off.
       Without a parameter, the current setting is shown.

       version

       Print the current version and the compile date in the status line.

       wall message

       Write a message to all displays. The message will appear in the  termi‐
       nal's status line.

       width [-w|-d] [cols [lines]]

       Toggle  the  window  width between 80 and 132 columns or set it to cols
       columns if an argument is specified.  This requires a capable  terminal
       and  the  termcap entries "Z0" and "Z1".  See the "termcap" command for
       more information. You can also specify a new  height  if  you  want  to
       change  both  values.   The -w option tells screen to leave the display
       size unchanged and just set the window size, -d vice versa.

       windowlist [-b] [-m] [-g]

       windowlist string [string]

       windowlist title [title]

       Display all windows in a table for visual window selection.  If  screen
       was  in a window group, screen will back out of the group and then dis‐
       play the windows in that group.  If the -b option is given, screen will
       switch to the blank window before presenting the list, so that the cur‐
       rent window is also selectable.  The -m option changes the order of the
       windows,  instead of sorting by window numbers screen uses its internal
       most-recently-used list.  The -g option will show  the  windows  inside
       any groups in that level and downwards.

       The following keys are used to navigate in "windowlist":


       tab(@); l l.  _ k, C-p, or up@Move up one line.  _ j, C-n, or down@Move
       down one line.  _ C-g or escape@Exit windowlist.  _ C-a or home@Move to
       the first line.  _ C-e or end@Move to the last line.  _ C-u or C-d@Move
       one half page up or down.  _ C-b or C-f@Move one full page up or  down.
       _   0..9@Using   the  number  keys,  move  to  the  selected  line.   _
       mouseclick@T{ Move to the selected line. Available when "mousetrack" is
       set to "on" T} _ /@Search.  _ n@Repeat search in the forward direction.
       _ N@Repeat search in the backward direction.  _ m@Toggle MRU.  _ g@Tog‐
       gle  group  nesting.  _ a@All window view.  _ C-h or backspace@Back out
       the group.  _ ,@Switch numbers with the previous  window.   _  .@Switch
       numbers  with  the  next  window.   _  K@Kill  that window.  _ space or
       enter@Select that window.  _

       The table format can be changed with the string and title  option,  the
       title  is displayed as table heading, while the lines are made by using
       the string setting. The default setting is "Num  Name%=Flags"  for  the
       title and "%3n %t%=%f" for the lines.  See the "STRING ESCAPES" chapter
       for more codes (e.g. color settings).

       "Windowlist" needs a region size of at least 10 characters wide  and  6
       characters high in order to display.

       windows [ string ]

       Uses  the message line to display a list of all the windows.  Each win‐
       dow is listed by number with the name of process that has been  started
       in  the window (or its title); the current window is marked with a `*';
       the previous window is marked with a `-';  all  the  windows  that  are
       "logged  in"  are  marked  with  a  `$';  a  background window that has
       received a bell is marked with a `!'; a background window that is being
       monitored  and  has  had activity occur is marked with an `@'; a window
       which has output logging turned on is marked with `(L)'; windows  occu‐
       pied  by  other  users are marked with `&'; windows in the zombie state
       are marked with `Z'.  If this list is too long to fit on the terminal's
       status  line  only  the portion around the current window is displayed.
       The optional string parameter follows the "STRING ESCAPES" format.   If
       string  parameter is passed, the output size is unlimited.  The default
       command without any parameter is limited to a size of 1024 bytes.

       wrap [on|off]

       Sets the line-wrap setting for the current window.  When  line-wrap  is
       on,  the second consecutive printable character output at the last col‐
       umn of a line will wrap to the start of  the  following  line.   As  an
       added feature, backspace (^H) will also wrap through the left margin to
       the previous line.  Default is `on'. Without any options, the state  of
       wrap is toggled.

       writebuf [-e encoding] [filename]

       Writes  the  contents of the paste buffer to the specified file, or the
       public accessible screen-exchange file if no filename is given. This is
       thought  of  as a primitive means of communication between screen users
       on the same host. If an encoding  is  specified  the  paste  buffer  is
       recoded on the fly to match the encoding.  The filename can be set with
       the bufferfile command and defaults to "/tmp/screen-exchange".

       writelock [on|off|auto]

       In addition to access control lists, not all users may be able to write
       to  the  same  window at once. Per default, writelock is in `auto' mode
       and grants exclusive input permission to the user who is the  first  to
       switch to the particular window. When he leaves the window, other users
       may obtain the writelock (automatically). The writelock of the  current
       window  is  disabled by the command "writelock off". If the user issues
       the command "writelock on" he  keeps  the  exclusive  write  permission
       while switching to other windows.

       xoff

       xon

       Insert  a  CTRL-s  / CTRL-q character to the stdin queue of the current
       window.

       zmodem [off|auto|catch|pass]

       zmodem sendcmd [string]

       zmodem recvcmd [string]

       Define zmodem support for  screen.  Screen  understands  two  different
       modes  when  it  detects  a zmodem request: "pass" and "catch".  If the
       mode is set to "pass", screen will relay all data to the attacher until
       the end of the transmission is reached.  In "catch" mode screen acts as
       a zmodem endpoint and starts the corresponding rz/sz commands.  If  the
       mode  is  set to "auto", screen will use "catch" if the window is a tty
       (e.g. a serial line), otherwise it will use "pass".

       You can define the templates screen uses in "catch" mode via the second
       and the third form.

       Note also that this is an experimental feature.

       zombie [keys[onerror]]

       Per  default screen windows are removed from the window list as soon as
       the windows process (e.g. shell) exits. When a string of  two  keys  is
       specified  to  the  zombie  command,  `dead' windows will remain in the
       list.  The kill command may be used to remove such a  window.  Pressing
       the first key in the dead window has the same effect. When pressing the
       second key, screen will attempt to resurrect the  window.  The  process
       that  was initially running in the window will be launched again. Call‐
       ing zombie without parameters will clear the zombie setting, thus  mak‐
       ing windows disappear when their process exits.

       As  the  zombie-setting  is  manipulated globally for all windows, this
       command should probably be called defzombie, but it isn't.

       Optionally you can put the word "onerror" after  the  keys.  This  will
       cause  screen to monitor exit status of the process running in the win‐
       dow. If it exits normally ('0'), the window disappears. Any other  exit
       value causes the window to become a zombie.

       zombie_timeout[seconds]

       Per  default screen windows are removed from the window list as soon as
       the windows process (e.g. shell) exits.  If  zombie  keys  are  defined
       (compare with above zombie command), it is possible to also set a time‐
       out when screen tries to automatically reconnect a dead screen window.


THE MESSAGE LINE
       Screen displays informational messages and other diagnostics in a  mes‐
       sage  line.   While this line is distributed to appear at the bottom of
       the screen, it can be defined to appear at the top of the screen during
       compilation.   If  your terminal has a status line defined in its term‐
       cap, screen will use this for displaying its messages, otherwise a line
       of  the  current screen will be temporarily overwritten and output will
       be momentarily interrupted. The message line is  automatically  removed
       after  a few seconds delay, but it can also be removed early (on termi‐
       nals without a status line) by beginning to type.

       The message line facility can be used by an application running in  the
       current  window  by means of the ANSI Privacy message control sequence.
       For instance, from within the shell, try something like:

              echo '<esc>^Hello world from window '$WINDOW'<esc>\\'

       where '<esc>' is an escape, '^' is a literal up-arrow, and  '\\'  turns
       into a single backslash.


WINDOW TYPES
       Screen  provides  three different window types. New windows are created
       with screen's screen command (see also the entry in chapter "CUSTOMIZA‐
       TION"). The first parameter to the screen command defines which type of
       window is created. The different window types are all special cases  of
       the  normal  type.  They have been added in order to allow screen to be
       used efficiently as a console multiplexer with 100 or more windows.


       ·  The normal window contains a shell  (default,  if  no  parameter  is
          given)  or  any  other  system command that could be executed from a
          shell (e.g.  slogin, etc...)


       ·  If a tty (character special device) name (e.g. "/dev/ttya") is spec‐
          ified  as the first parameter, then the window is directly connected
          to this device.  This window  type  is  similar  to  "screen  cu  -l
          /dev/ttya".   Read  and write access is required on the device node,
          an exclusive open is attempted on the node to  mark  the  connection
          line  as  busy.   An  optional  parameter is allowed consisting of a
          comma separated list of flags in the notation used by stty(1):

          <baud_rate>
                 Usually 300, 1200, 9600 or 19200. This  affects  transmission
                 as well as receive speed.

          cs8 or cs7
                 Specify the transmission of eight (or seven) bits per byte.

          ixon or -ixon
                 Enables  (or  disables) software flow-control (CTRL-S/CTRL-Q)
                 for sending data.

          ixoff or -ixoff
                 Enables (or disables)  software  flow-control  for  receiving
                 data.

          istrip or -istrip
                 Clear (or keep) the eight bit in each received byte.

          You  may  want  to  specify  as many of these options as applicable.
          Unspecified options cause the terminal driver to make up the parame‐
          ter values of the connection.  These values are system dependent and
          may be in defaults or values saved from a previous connection.

          For tty windows, the info command shows some of  the  modem  control
          lines  in  the  status  line. These may include `RTS', `CTS', 'DTR',
          `DSR', `CD' and more.  This depends on the available  ioctl()'s  and
          system  header  files as well as the on the physical capabilities of
          the serial board.  Signals that  are  logical  low  (inactive)  have
          their name preceded by an exclamation mark (!), otherwise the signal
          is logical high (active).  Signals not supported by the hardware but
          available to the ioctl() interface are usually shown low.

          When  the  CLOCAL status bit is true, the whole set of modem signals
          is placed inside curly braces ({ and }).  When the CRTSCTS or  TIOC‐
          SOFTCAR bit is set, the signals `CTS' or `CD' are shown in parenthe‐
          sis, respectively.

          For tty windows, the command break causes the Data transmission line
          (TxD)  to go low for a specified period of time. This is expected to
          be interpreted as break signal on the other side.  No data  is  sent
          and no modem control line is changed when a break is issued.


       ·  If  the  first  parameter  is  "//telnet",  the  second parameter is
          expected to be a host name, and  an  optional  third  parameter  may
          specify a TCP port number (default decimal 23).  Screen will connect
          to a server listening on the remote host and use the telnet protocol
          to communicate with that server.

       For telnet windows, the command info shows details about the connection
       in square brackets ([ and ]) at the end of the status line.

              b      BINARY. The connection is in binary mode.

              e      ECHO. Local echo is disabled.

              c      SGA. The connection  is  in  `character  mode'  (default:
                     `line mode').

              t      TTYPE. The terminal type has been requested by the remote
                     host.  Screen sends the name "screen"  unless  instructed
                     otherwise (see also the command `term').

              w      NAWS.  The  remote  site  is  notified  about window size
                     changes.

              f      LFLOW. The remote host will send  flow  control  informa‐
                     tion.  (Ignored at the moment.)

              Additional  flags for debugging are x, t and n (XDISPLOC, TSPEED
              and NEWENV).

              For telnet windows, the command break sends the telnet code  IAC
              BREAK (decimal 243) to the remote host.


              This  window  type is only available if screen was compiled with
              the ENABLE_TELNET option defined.



STRING ESCAPES
       Screen provides an escape mechanism to insert information like the cur‐
       rent time into messages or file names. The escape character is '%' with
       one exception: inside of a window's  hardstatus  '^%'  ('^E')  is  used
       instead.

       Here is the full list of supported escapes:

       %      the escape character itself

       E      sets %? to true if the escape character has been pressed.

       f      flags  of  the window, see "windows" for meanings of the various
              flags

       F      sets %? to true if the window has the focus

       h      hardstatus of the window

       H      hostname of the system

       n      window number

       P      sets %? to true if the current region is in copy/paste mode

       S      session name

       s      window size

       t      window title

       u      all other users on this window

       w      all window numbers and names. With '-' qualifier: up to the cur‐
              rent  window; with '+' qualifier: starting with the window after
              the current one.

       W      all window numbers and names except the current one

       x      the executed command including arguments running in this windows

       X      the executed command without arguments running in this windows

       ?      the part to the next '%?' is displayed  only  if  a  '%'  escape
              inside the part expands to a non-empty string

       :      else part of '%?'

       =      pad  the  string to the display's width (like TeX's hfill). If a
              number is specified, pad  to  the  percentage  of  the  window's
              width.   A  '0'  qualifier  tells  screen to treat the number as
              absolute position.  You can specify to pad relative to the  last
              absolute  pad position by adding a '+' qualifier or to pad rela‐
              tive to the right margin by using '-'. The padding truncates the
              string  if  the specified position lies before the current posi‐
              tion. Add the 'L' qualifier to change this.

       <      same as '%=' but just do truncation, do not fill with spaces

       >      mark the current text position for  the  next  truncation.  When
              screen  needs  to do truncation, it tries to do it in a way that
              the marked position gets moved to the  specified  percentage  of
              the  output  area.  (The  area starts from the last absolute pad
              position and ends with the position specified by the  truncation
              operator.)  The 'L' qualifier tells screen to mark the truncated
              parts with '...'.

       {      attribute/color modifier string terminated by the next "}"

       `      Substitute with the output of a 'backtick' command.  The  length
              qualifier is misused to identify one of the commands.

       The  'c'  and 'C' escape may be qualified with a '0' to make screen use
       zero instead of space as fill character. The '0' qualifier  also  makes
       the  '='  escape use absolute positions. The 'n' and '=' escapes under‐
       stand a length qualifier (e.g. '%3n'), 'D' and 'M' can be prefixed with
       'L'  to  generate long names, 'w' and 'W' also show the window flags if
       'L' is given.

       An attribute/color modifier is used to change  the  attributes  or  the
       color  settings.  Its  format  is "[attribute modifier] [color descrip‐
       tion]". The attribute modifier must be prefixed by a change type  indi‐
       cator  if  it  can  be confused with a color description. The following
       change types are known:

       +      add the specified set to the current attributes

       -      remove the set from the current attributes

       !      invert the set in the current attributes

       =      change the current attributes to the specified set

       The attribute set can either be specified as a hexadecimal number or  a
       combination of the following letters:

       d      dim
       u      underline
       b      bold
       r      reverse
       s      standout
       B      blinking

       Colors are coded either as a hexadecimal number or two letters specify‐
       ing the desired background and foreground color (in  that  order).  The
       following colors are known:

       k      black
       r      red
       g      green
       y      yellow
       b      blue
       m      magenta
       c      cyan
       w      white
       d      default color
       .      leave color unchanged

       The  capitalized  versions of the letter specify bright colors. You can
       also use the pseudo-color 'i' to set just the brightness and leave  the
       color unchanged.
       A  one digit/letter color description is treated as foreground or back‐
       ground color dependent on the current attributes: if  reverse  mode  is
       set,  the  background color is changed instead of the foreground color.
       If you don't like this, prefix the color with a ".". If  you  want  the
       same  behavior for two-letter color descriptions, also prefix them with
       a ".".
       As a special case, "%{-}" restores the attributes and colors that  were
       set before the last change was made (i.e., pops one level of the color-
       change stack).

       Examples:

       "G"    set color to bright green

       "+b r" use bold red

       "= yd" clear all attributes, write in default  color  on  yellow  back‐
              ground.

       %-Lw%{= BW}%50>%n%f* %t%{-}%+Lw%<
              The  available  windows centered at the current window and trun‐
              cated to the available width. The current  window  is  displayed
              white  on  blue.   This can be used with "hardstatus alwayslast‐
              line".

       %?%F%{.R.}%?%3n %t%? [%h]%?
              The window number and title and the window's hardstatus, if  one
              is  set.  Also use a red background if this is the active focus.
              Useful for "caption string".

FLOW-CONTROL
       Each window has a flow-control setting that determines how screen deals
       with the XON and XOFF characters (and perhaps the interrupt character).
       When flow-control is turned off, screen ignores the XON and XOFF  char‐
       acters,  which  allows  the user to send them to the current program by
       simply typing them (useful for the emacs editor,  for  instance).   The
       trade-off  is  that it will take longer for output from a "normal" pro‐
       gram to pause in response to an XOFF.  With flow-control turned on, XON
       and  XOFF  characters  are  used to immediately pause the output of the
       current window.  You can still send these  characters  to  the  current
       program, but you must use the appropriate two-character screen commands
       (typically "C-a q" (xon) and "C-a s" (xoff)).   The  xon/xoff  commands
       are  also useful for typing C-s and C-q past a terminal that intercepts
       these characters.

       Each window has an initial flow-control value set with  either  the  -f
       option  or the "defflow" .screenrc command. Per default the windows are
       set to automatic flow-switching.  It can then be  toggled  between  the
       three states 'fixed on', 'fixed off' and 'automatic' interactively with
       the "flow" command bound to "C-a f".

       The automatic flow-switching mode deals with  flow  control  using  the
       TIOCPKT  mode  (like "rlogin" does). If the tty driver does not support
       TIOCPKT, screen tries to find out the right mode based on  the  current
       setting of the application keypad - when it is enabled, flow-control is
       turned off and visa versa.  Of course, you can still  manipulate  flow-
       control manually when needed.

       If  you're running with flow-control enabled and find that pressing the
       interrupt key (usually  C-c)  does  not  interrupt  the  display  until
       another 6-8 lines have scrolled by, try running screen with the "inter‐
       rupt" option (add the "interrupt" flag to the "flow"  command  in  your
       .screenrc,  or use the -i command-line option).  This causes the output
       that screen has accumulated from the interrupted program to be flushed.
       One  disadvantage  is  that  the virtual terminal's memory contains the
       non-flushed version of the output, which in rare cases can cause  minor
       inaccuracies  in  the  output.   For example, if you switch screens and
       return, or update the screen with "C-a l" you would see the version  of
       the  output  you would have gotten without "interrupt" being on.  Also,
       you might need to turn off flow-control (or use auto-flow mode to  turn
       it  off  automatically) when running a program that expects you to type
       the interrupt character as input, as it is possible  to  interrupt  the
       output of the virtual terminal to your physical terminal when flow-con‐
       trol is enabled.  If this happens, a simple refresh of the screen  with
       "C-a  l" will restore it.  Give each mode a try, and use whichever mode
       you find more comfortable.



TITLES (naming windows)
       You can customize each window's name in the window display (viewed with
       the "windows" command (C-a w)) by setting it with one of the title com‐
       mands.  Normally the name displayed is the actual command name  of  the
       program created in the window.  However, it is sometimes useful to dis‐
       tinguish various programs of the same name or to change  the  name  on-
       the-fly to reflect the current state of the window.

       The default name for all shell windows can be set with the "shelltitle"
       command in the .screenrc file, while all other windows are created with
       a "screen" command and thus can have their name set with the -t option.
       Interactively,    there    is    the    title-string    escape-sequence
       (<esc>kname<esc>\)  and the "title" command (C-a A).  The former can be
       output from an application to control the window's name under  software
       control,  and  the  latter  will prompt for a name when typed.  You can
       also bind pre-defined names to keys with the  "title"  command  to  set
       things  quickly  without  prompting.  Changing  title  by  this  escape
       sequence can be controlled by  defdynamictitle  and  dynamictitle  com‐
       mands.

       Finally,  screen has a shell-specific heuristic that is enabled by set‐
       ting the window's name to "search|name" and arranging to  have  a  null
       title escape-sequence output as a part of your prompt.  The search por‐
       tion specifies an end-of-prompt search string, while the  name  portion
       specifies the default shell name for the window.  If the name ends in a
       `:' screen will add what it believes to be the current command  running
       in  the window to the end of the window's shell name (e.g. "name:cmd").
       Otherwise the current command name supersedes the shell name  while  it
       is running.

       Here's  how  it  works:   you must modify your shell prompt to output a
       null title-escape-sequence (<esc>k<esc>\) as a  part  of  your  prompt.
       The  last part of your prompt must be the same as the string you speci‐
       fied for the search portion of the title.  Once this is set up,  screen
       will  use  the title-escape-sequence to clear the previous command name
       and get ready for the next command.  Then, when a newline  is  received
       from  the shell, a search is made for the end of the prompt.  If found,
       it will grab the first word after the matched string and use it as  the
       command  name.  If the command name begins with either '!', '%', or '^'
       screen will use the first word on the  following  line  (if  found)  in
       preference  to  the  just-found  name.  This helps csh users get better
       command names when using job control or history recall commands.

       Here's some .screenrc examples:

              screen -t top 2 nice top

       Adding this line to your .screenrc would start a nice-d version of  the
       "top" command in window 2 named "top" rather than "nice".

                   shelltitle '> |csh'
                   screen 1

       These  commands  would  start  a  shell with the given shelltitle.  The
       title specified is an auto-title that would expect the prompt  and  the
       typed command to look something like the following:

              /usr/joe/src/dir> trn

       (it  looks  after  the  '>  ' for the command name).  The window status
       would show the name "trn" while the command was running, and revert  to
       "csh" upon completion.

              bind R screen -t '% |root:' su

       Having  this command in your .screenrc would bind the key sequence "C-a
       R" to the "su" command and give it an auto-title name of "root:".   For
       this auto-title to work, the screen could look something like this:

                   % !em
                   emacs file.c

       Here  the user typed the csh history command "!em" which ran the previ‐
       ously  entered  "emacs"  command.   The  window   status   would   show
       "root:emacs"  during the execution of the command, and revert to simply
       "root:" at its completion.

                   bind o title
                   bind E title ""
                   bind u title (unknown)

       The first binding doesn't have any arguments, so it  would  prompt  you
       for  a  title when you type "C-a o".  The second binding would clear an
       auto-title's current setting (C-a E).  The third binding would set  the
       current window's title to "(unknown)" (C-a u).

       One  thing  to keep in mind when adding a null title-escape-sequence to
       your prompt is that some shells (like the csh) count all  the  non-con‐
       trol  characters  as  part  of the prompt's length.  If these invisible
       characters aren't a multiple of 8 then  backspacing  over  a  tab  will
       result in an incorrect display.  One way to get around this is to use a
       prompt like this:

              set prompt='^[[0000m^[k^[\% '

       The escape-sequence "<esc>[0000m" not  only  normalizes  the  character
       attributes, but all the zeros round the length of the invisible charac‐
       ters up to 8.  Bash  users  will  probably  want  to  echo  the  escape
       sequence in the PROMPT_COMMAND:

              PROMPT_COMMAND='printf "\033k\033\134"'

       (I used "\134" to output a `\' because of a bug in bash v1.04).



THE VIRTUAL TERMINAL
       Each  window  in  a screen session emulates a VT100 terminal, with some
       extra functions added. The VT100 emulator is hard-coded, no other  ter‐
       minal types can be emulated.
       Usually  screen  tries to emulate as much of the VT100/ANSI standard as
       possible. But if your terminal lacks certain capabilities,  the  emula‐
       tion  may not be complete. In these cases screen has to tell the appli‐
       cations that some of the features are missing. This is  no  problem  on
       machines using termcap, because screen can use the $TERMCAP variable to
       customize the standard screen termcap.

       But if you do a rlogin on another machine or your machine supports only
       terminfo  this  method  fails.  Because of this, screen offers a way to
       deal with these cases.  Here is how it works:

       When screen tries to figure out a terminal name for  itself,  it  first
       looks  for an entry named "screen.<term>", where <term> is the contents
       of your $TERM variable.  If no such entry exists, screen tries "screen"
       (or  "screen-w"  if  the terminal is wide (132 cols or more)).  If even
       this entry cannot be found, "vt100" is used as a substitute.

       The idea is that if you have a terminal which doesn't support an impor‐
       tant  feature  (e.g.  delete  char or clear to EOS) you can build a new
       termcap/terminfo entry for screen (named "screen.<dumbterm>") in  which
       this  capability  has been disabled. If this entry is installed on your
       machines you are able to do a rlogin and still keep the  correct  term‐
       cap/terminfo  entry.  The terminal name is put in the $TERM variable of
       all new windows.  Screen also sets the $TERMCAP variable reflecting the
       capabilities of the virtual terminal emulated. Notice that, however, on
       machines using the terminfo database this variable has no effect.  Fur‐
       thermore, the variable $WINDOW is set to the window number of each win‐
       dow.

       The actual set  of  capabilities  supported  by  the  virtual  terminal
       depends  on  the  capabilities supported by the physical terminal.  If,
       for instance, the physical terminal does not support  underscore  mode,
       screen  does  not  put the `us' and `ue' capabilities into the window's
       $TERMCAP variable, accordingly.  However, a minimum number of capabili‐
       ties  must  be  supported  by a terminal in order to run screen; namely
       scrolling, clear screen, and direct  cursor  addressing  (in  addition,
       screen  does  not  run on hardcopy terminals or on terminals that over-
       strike).

       Also, you can customize the $TERMCAP value used by screen by using  the
       "termcap"  .screenrc  command,  or  by defining the variable $SCREENCAP
       prior to startup.  When the latter is defined, its value will be copied
       verbatim  into each window's $TERMCAP variable.  This can either be the
       full terminal definition, or a filename  where  the  terminal  "screen"
       (and/or "screen-w") is defined.

       Note  that screen honors the "terminfo" .screenrc command if the system
       uses the terminfo database rather than termcap.

       When the boolean `G0' capability is present in the  termcap  entry  for
       the terminal on which screen has been called, the terminal emulation of
       screen supports multiple character sets.  This allows an application to
       make use of, for instance, the VT100 graphics character set or national
       character sets.  The following control functions from ISO 2022 are sup‐
       ported:  lock  shift  G0  (SI), lock shift G1 (SO), lock shift G2, lock
       shift G3, single shift G2, and single shift G3.  When a virtual  termi‐
       nal  is  created  or reset, the ASCII character set is designated as G0
       through G3.  When the `G0' capability is present, screen evaluates  the
       capabilities  `S0', `E0', and `C0' if present. `S0' is the sequence the
       terminal uses to enable and start the  graphics  character  set  rather
       than  SI.   `E0'  is the corresponding replacement for SO. `C0' gives a
       character by character translation string that  is  used  during  semi-
       graphics  mode.  This string is built like the `acsc' terminfo capabil‐
       ity.

       When the `po' and `pf' capabilities are present in the terminal's term‐
       cap  entry,  applications running in a screen window can send output to
       the printer port of the terminal.  This allows a user to have an appli‐
       cation  in one window sending output to a printer connected to the ter‐
       minal, while all other windows are still active (the  printer  port  is
       enabled  and  disabled  again  for  each  chunk of output).  As a side-
       effect, programs running in different windows can send  output  to  the
       printer  simultaneously.   Data sent to the printer is not displayed in
       the window.  The info command displays a line starting `PRIN' while the
       printer is active.

       Screen  maintains  a hardstatus line for every window. If a window gets
       selected, the display's hardstatus will be updated to  match  the  win‐
       dow's  hardstatus  line. If the display has no hardstatus the line will
       be displayed as a standard screen message.  The hardstatus line can  be
       changed    with   the   ANSI   Application   Program   Command   (APC):
       "ESC_<string>ESC\". As a  convenience  for  xterm  users  the  sequence
       "ESC]0..2;<string>^G" is also accepted.

       Some  capabilities  are only put into the $TERMCAP variable of the vir‐
       tual terminal if they can be efficiently implemented  by  the  physical
       terminal.  For instance, `dl' (delete line) is only put into the $TERM‐
       CAP variable if the terminal supports  either  delete  line  itself  or
       scrolling  regions. Note that this may provoke confusion, when the ses‐
       sion is reattached on a different terminal, as the  value  of  $TERMCAP
       cannot be modified by parent processes.

       The  "alternate  screen" capability is not enabled by default.  Set the
       altscreen .screenrc command to enable it.

       The following is a list of  control  sequences  recognized  by  screen.
       "(V)" and "(A)" indicate VT100-specific and ANSI- or ISO-specific func‐
       tions, respectively.

       ESC E                      Next Line

       ESC D                      Index

       ESC M                      Reverse Index

       ESC H                      Horizontal Tab Set

       ESC Z                      Send VT100 Identification String

       ESC 7                 (V)  Save Cursor and Attributes

       ESC 8                 (V)  Restore Cursor and Attributes

       ESC [s                (A)  Save Cursor and Attributes

       ESC [u                (A)  Restore Cursor and Attributes

       ESC c                      Reset to Initial State

       ESC g                      Visual Bell

       ESC Pn p                   Cursor Visibility (97801)

                                  Pn = 6                     Invisible

                                  Pn = 7                     Visible

       ESC =                 (V)  Application Keypad Mode

       ESC >                 (V)  Numeric Keypad Mode

       ESC # 8               (V)  Fill Screen with E's

       ESC \                 (A)  String Terminator

       ESC ^                 (A)  Privacy Message String (Message Line)

       ESC !                      Global Message String (Message Line)

       ESC k                      A.k.a. Definition String

       ESC P                 (A)  Device Control  String.   Outputs  a  string
                                  directly to the host terminal without inter‐
                                  pretation.

       ESC _                 (A)  Application Program Command (Hardstatus)

       ESC ] 0 ; string ^G   (A)  Operating System Command (Hardstatus,  xterm
                                  title hack)

       ESC ] 83 ; cmd ^G     (A)  Execute  screen  command. This only works if
                                  multi-user support is compiled into  screen.
                                  The  pseudo-user ":window:" is used to check
                                  the access control list. Use  "addacl  :win‐
                                  dow:  -rwx  #?"  to  create  a  user with no
                                  rights and allow only the needed commands.

       Control-N             (A)  Lock Shift G1 (SO)

       Control-O             (A)  Lock Shift G0 (SI)

       ESC n                 (A)  Lock Shift G2

       ESC o                 (A)  Lock Shift G3

       ESC N                 (A)  Single Shift G2

       ESC O                 (A)  Single Shift G3

       ESC ( Pcs             (A)  Designate character set as G0

       ESC ) Pcs             (A)  Designate character set as G1

       ESC * Pcs             (A)  Designate character set as G2

       ESC + Pcs             (A)  Designate character set as G3

       ESC [ Pn ; Pn H            Direct Cursor Addressing

       ESC [ Pn ; Pn f            same as above

       ESC [ Pn J                 Erase in Display

                                  Pn = None or 0             From  Cursor   to
                                                             End of Screen

                                  Pn = 1                     From Beginning of
                                                             Screen to Cursor

                                  Pn = 2                     Entire Screen

       ESC [ Pn K                 Erase in Line

                                  Pn = None or 0             From  Cursor   to
                                                             End of Line

                                  Pn = 1                     From Beginning of
                                                             Line to Cursor

                                  Pn = 2                     Entire Line

       ESC [ Pn X                 Erase character

       ESC [ Pn A                 Cursor Up

       ESC [ Pn B                 Cursor Down

       ESC [ Pn C                 Cursor Right

       ESC [ Pn D                 Cursor Left

       ESC [ Pn E                 Cursor next line

       ESC [ Pn F                 Cursor previous line

       ESC [ Pn G                 Cursor horizontal position

       ESC [ Pn `                 same as above

       ESC [ Pn d                 Cursor vertical position

       ESC [ Ps ;...; Ps m        Select Graphic Rendition

                                  Ps = None or 0             Default Rendition

                                  Ps = 1                     Bold

                                  Ps = 2                (A)  Faint

                                  Ps = 3                (A)  Standout     Mode
                                                             (ANSI:     Itali‐
                                                             cized)

                                  Ps = 4                     Underlined

                                  Ps = 5                     Blinking

                                  Ps = 7                     Negative Image

                                  Ps = 22               (A)  Normal Intensity

                                  Ps = 23               (A)  Standout Mode off
                                                             (ANSI: Italicized
                                                             off)

                                  Ps = 24               (A)  Not Underlined

                                  Ps = 25               (A)  Not Blinking

                                  Ps = 27               (A)  Positive Image

                                  Ps = 30               (A)  Foreground Black

                                  Ps = 31               (A)  Foreground Red

                                  Ps = 32               (A)  Foreground Green

                                  Ps = 33               (A)  Foreground Yellow

                                  Ps = 34               (A)  Foreground Blue

                                  Ps = 35               (A)  Foreground
                                                             Magenta

                                  Ps = 36               (A)  Foreground Cyan

                                  Ps = 37               (A)  Foreground White

                                  Ps = 39               (A)  Foreground
                                                             Default

                                  Ps = 40               (A)  Background Black

                                  Ps = ...

                                  Ps = 49               (A)  Background
                                                             Default

       ESC [ Pn g                 Tab Clear

                                  Pn = None or 0             Clear Tab at Cur‐
                                                             rent Position

                                  Pn = 3                     Clear All Tabs

       ESC [ Pn ; Pn r       (V)  Set Scrolling Region

       ESC [ Pn I            (A)  Horizontal Tab

       ESC [ Pn Z            (A)  Backward Tab

       ESC [ Pn L            (A)  Insert Line

       ESC [ Pn M            (A)  Delete Line

       ESC [ Pn @            (A)  Insert Character

       ESC [ Pn P            (A)  Delete Character

       ESC [ Pn S                 Scroll Scrolling Region Up

       ESC [ Pn T                 Scroll Scrolling Region Down

       ESC [ Pn ^                 same as above

       ESC [ Ps ;...; Ps h        Set Mode

       ESC [ Ps ;...; Ps l        Reset Mode

                                  Ps = 4                (A)  Insert Mode

                                  Ps = 20               (A)  Automatic   Line‐
                                                             feed Mode

                                  Ps = 34                    Normal     Cursor
                                                             Visibility

                                  Ps = ?1               (V)  Application  Cur‐
                                                             sor Keys

                                  Ps = ?3               (V)  Change   Terminal
                                                             Width to 132 col‐
                                                             umns

                                  Ps = ?5               (V)  Reverse Video

                                  Ps = ?6               (V)  Origin Mode

                                  Ps = ?7               (V)  Wrap Mode

                                  Ps = ?9                    X10  mouse track‐
                                                             ing

                                  Ps = ?25              (V)  Visible Cursor

                                  Ps = ?47                   Alternate  Screen
                                                             (old xterm code)

                                  Ps = ?1000            (V)  VT200       mouse
                                                             tracking

                                  Ps = ?1047                 Alternate  Screen
                                                             (new xterm code)

                                  Ps = ?1049                 Alternate  Screen
                                                             (new xterm code)

       ESC [ 5 i             (A)  Start relay to printer (ANSI Media Copy)

       ESC [ 4 i             (A)  Stop relay to printer (ANSI Media Copy)

       ESC [ 8 ; Ph ; Pw t        Resize the window to  `Ph'  lines  and  `Pw'
                                  columns (SunView special)

       ESC [ c                    Send VT100 Identification String

       ESC [ x                    Send Terminal Parameter Report

       ESC [ > c                  Send   VT220   Secondary  Device  Attributes
                                  String

       ESC [ 6 n                  Send Cursor Position Report



INPUT TRANSLATION
       In order to do a full VT100 emulation  screen  has  to  detect  that  a
       sequence  of characters in the input stream was generated by a keypress
       on the user's keyboard and insert  the  VT100  style  escape  sequence.
       Screen  has  a very flexible way of doing this by making it possible to
       map arbitrary commands on arbitrary sequences of characters. For  stan‐
       dard  VT100  emulation  the  command will always insert a string in the
       input buffer of the window (see also command stuff in the  command  ta‐
       ble).  Because the sequences generated by a keypress can change after a
       reattach from a different terminal type, it is possible  to  bind  com‐
       mands  to the termcap name of the keys.  Screen will insert the correct
       binding after each  reattach.  See  the  bindkey  command  for  further
       details on the syntax and examples.

       Here  is the table of the default key bindings. The fourth is what com‐
       mand is executed if the keyboard is switched into application mode.

       allbox; l l l l.   Key  name              Termcap  nameCommandApp  mode
       Cursor  up          ku\033[A\033OA Cursor down           kd\033[B\033OB
       Cursor               right          kr\033[C\033OC               Cursor
       left           kl\033[D\033OD Function key 0        k0\033[10~ Function
       key 1         k1\033OP  Function  key  2        k2\033OQ  Function  key
       3        k3\033OR   Function   key   4        k4\033OS   Function   key
       5        k5\033[15~  Function  key  6        k6\033[17~  Function   key
       7        k7\033[18~   Function  key  8        k8\033[19~  Function  key
       9        k9\033[20~  Function  key  10       k;\033[21~  Function   key
       11       F1\033[23~        Function       key       12       F2\033[24~
       Home                  kh\033[1~         End                   kH\033[4~
       Insert                kI\033[2~   Delete                kD\033[3~  Page
       up               kP\033[5~   Page   down             kN\033[6~   Keypad
       0              f00\033Op    Keypad    1              f11\033Oq   Keypad
       2              f22\033Or   Keypad    3              f33\033Os    Keypad
       4              f44\033Ot    Keypad    5              f55\033Ou   Keypad
       6              f66\033Ov   Keypad    7              f77\033Ow    Keypad
       8              f88\033Ox    Keypad    9              f99\033Oy   Keypad
       +              f++\033Ok   Keypad    -              f--\033Om    Keypad
       *              f**\033Oj    Keypad    /              f//\033Oo   Keypad
       =              fq=\033OX   Keypad    .              f..\033On    Keypad
       ,              f,,\033Ol Keypad enter          fe\015\033OM


SPECIAL TERMINAL CAPABILITIES
       The following table describes all terminal capabilities that are recog‐
       nized by screen and are not in the termcap(5) manual.   You  can  place
       these  capabilities  in your termcap entries (in `/etc/termcap') or use
       them with the commands `termcap', `terminfo' and `termcapinfo' in  your
       screenrc files. It is often not possible to place these capabilities in
       the terminfo database.

       LP   (bool)  Terminal has VT100 style margins (`magic  margins').  Note
                    that  this  capability is obsolete because screen uses the
                    standard 'xn' instead.

       Z0   (str)   Change width to 132 columns.

       Z1   (str)   Change width to 80 columns.

       WS   (str)   Resize display. This capability has the desired width  and
                    height as arguments. SunView(tm) example: '\E[8;%d;%dt'.

       NF   (bool)  Terminal  doesn't need flow control. Send ^S and ^Q direct
                    to the application. Same as 'flow off'.  The  opposite  of
                    this capability is 'nx'.

       G0   (bool)  Terminal can deal with ISO 2022 font selection sequences.

       S0   (str)   Switch  charset  'G0' to the specified charset. Default is
                    '\E(%.'.

       E0   (str)   Switch charset 'G0' back to standard charset.  Default  is
                    '\E(B'.

       C0   (str)   Use the string as a conversion table for font '0'. See the
                    'ac' capability for more details.

       CS   (str)   Switch cursor-keys to application mode.

       CE   (str)   Switch cursor-keys back to normal mode.

       AN   (bool)  Turn on autonuke. See  the  'autonuke'  command  for  more
                    details.

       OL   (num)   Set  the  output buffer limit. See the 'obuflimit' command
                    for more details.

       KJ   (str)   Set the encoding of the terminal. See the 'encoding'  com‐
                    mand for valid encodings.

       AF   (str)   Change  character foreground color in an ANSI conform way.
                    This capability will almost always  be  set  to  '\E[3%dm'
                    ('\E[3%p1%dm' on terminfo machines).

       AB   (str)   Same as 'AF', but change background color.

       AX   (bool)  Does  understand  ANSI  set  default fg/bg color (\E[39m /
                    \E[49m).

       XC   (str)   Describe a translation of characters to strings  depending
                    on  the current font. More details follow in the next sec‐
                    tion.

       XT   (bool)  Terminal understands special xterm sequences  (OSC,  mouse
                    tracking).

       C8   (bool)  Terminal needs bold to display high-intensity colors (e.g.
                    Eterm).

       TF   (bool)  Add missing capabilities to the termcap/info  entry.  (Set
                    by default).


CHARACTER TRANSLATION
       Screen  has  a  powerful mechanism to translate characters to arbitrary
       strings depending on the current font and terminal type.  Use this fea‐
       ture  if  you  want  to  work with a common standard character set (say
       ISO8851-latin1) even on terminals that scatter the more unusual charac‐
       ters over several national language font pages.

       Syntax:
           XC=<charset-mapping>{,,<charset-mapping>}
           <charset-mapping> := <designator><template>{,<mapping>}
           <mapping> := <char-to-be-mapped><template-arg>

       The things in braces may be repeated any number of times.

       A  <charset-mapping> tells screen how to map characters in font <desig‐
       nator> ('B': Ascii, 'A': UK, 'K':  German,  etc.)   to  strings.  Every
       <mapping>  describes  to  what string a single character will be trans‐
       lated. A template mechanism is used, as most of the time the codes have
       a  lot  in  common  (for  example strings to switch to and from another
       charset). Each occurrence of '%' in <template>  gets  substituted  with
       the  <template-arg>  specified  together  with  the  character. If your
       strings are not similar at all, then use '%' as a  template  and  place
       the  full  string  in  <template-arg>. A quoting mechanism was added to
       make it possible to use a real '%'. The '\' character quotes  the  spe‐
       cial characters '\', '%', and ','.

       Here is an example:

           termcap hp700 'XC=B\E(K%\E(B,\304[,\326\\\\,\334]'

       This  tells  screen how to translate ISOlatin1 (charset 'B') upper case
       umlaut characters on a hp700 terminal that has a German charset. '\304'
       gets  translated  to  '\E(K[\E(B'  and so on.  Note that this line gets
       parsed *three* times before the internal lookup table is built,  there‐
       fore a lot of quoting is needed to create a single '\'.

       Another  extension  was  added  to  allow  more emulation: If a mapping
       translates the unquoted '%' char, it will be sent to the terminal when‐
       ever screen switches to the corresponding <designator>. In this special
       case the template is assumed to be just '%' because the charset  switch
       sequence and the character mappings normally haven't much in common.

       This example shows one use of the extension:

           termcap xterm 'XC=K%,%\E(B,[\304,\\\\\326,]\334'

       Here,  a  part of the German ('K') charset is emulated on an xterm.  If
       screen has to change to the 'K' charset, '\E(B' will  be  sent  to  the
       terminal,  i.e. the ASCII charset is used instead. The template is just
       '%', so the mapping is straightforward: '[' to '\304', '\'  to  '\326',
       and ']' to '\334'.


ENVIRONMENT
       COLUMNS        Number  of  columns  on  the terminal (overrides termcap
                      entry).
       HOME           Directory in which to look for .screenrc.
       LINES          Number of  lines  on  the  terminal  (overrides  termcap
                      entry).
       LOCKPRG        Screen lock program.
       NETHACKOPTIONS Turns on nethack option.
       PATH           Used for locating programs to run.
       SCREENCAP      For customizing a terminal's TERMCAP value.
       SCREENDIR      Alternate socket directory.
       SCREENRC       Alternate user screenrc file.
       SHELL          Default  shell  program  for  opening  windows  (default
                      "/bin/sh").  See also "shell" .screenrc command.
       STY            Alternate socket name.
       SYSSCREENRC    Alternate system screenrc file.
       TERM           Terminal name.
       TERMCAP        Terminal description.
       WINDOW         Window number of a window (at creation time).

FILES
       .../screen-4.?.??/etc/screenrc
       .../screen-4.?.??/etc/etcscreenrc Examples in the  screen  distribution
                                         package  for  private and global ini‐
                                         tialization files.
       $SYSSCREENRC
       /usr/local/etc/screenrc           screen initialization commands
       $SCREENRC
       $HOME/.screenrc                   Read in after /usr/local/etc/screenrc
       $SCREENDIR/S-<login>
       /local/screens/S-<login>          Socket directories (default)
       /usr/tmp/screens/S-<login>        Alternate socket directories.
       <socket directory>/.termcap       Written by the "termcap" output func‐
                                         tion
       /usr/tmp/screens/screen-exchange  or
       /tmp/screen-exchange              screen   `interprocess  communication
                                         buffer'
       hardcopy.[0-9]                    Screen images created by the hardcopy
                                         function
       screenlog.[0-9]                   Output  log  files created by the log
                                         function
       /usr/lib/terminfo/?/*             or
       /etc/termcap                      Terminal capability databases
       /etc/utmp                         Login records
       $LOCKPRG                          Program that locks a terminal.


SEE ALSO
       termcap(5), utmp(5), vi(1), captoinfo(1), tic(1)


AUTHORS
       Originally created by Oliver Laumann. For a long  time  maintained  and
       developed by Juergen Weigert, Michael Schroeder, Micah Cowan and Sadrul
       Habib Chowdhury. Since 2015 maintained and developed by Amadeusz  Slaw‐
       inski  <amade@asmblr.net>  and Alexander Naumov <alexander_naumov@open‐
       suse.org>.

COPYLEFT
       Copyright (c) 2018-2020
            Alexander Naumov <alexander_naumov@opensuse.org>
            Amadeusz Slawinski <amade@asmblr.net>
       Copyright (c) 2015-2017
            Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
            Alexander Naumov <alexander_naumov@opensuse.org>
            Amadeusz Slawinski <amade@asmblr.net>
       Copyright (c) 2010-2015
            Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
            Sadrul Habib Chowdhury <sadrul@users.sourceforge.net>
       Copyright (c) 2008, 2009
            Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
            Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
            Micah Cowan <micah@cowan.name>
            Sadrul Habib Chowdhury <sadrul@users.sourceforge.net>
       Copyright (C) 1993-2003
            Juergen Weigert <jnweiger@immd4.informatik.uni-erlangen.de>
            Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
       Copyright (C) 1987 Oliver Laumann
       This program is free software; you can redistribute it and/or modify it
       under  the  terms of the GNU General Public License as published by the
       Free Software Foundation; either version 3, or  (at  your  option)  any
       later version.
       This  program  is  distributed  in the hope that it will be useful, but
       WITHOUT ANY  WARRANTY;  without  even  the  implied  warranty  of  MER‐
       CHANTABILITY  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
       Public License for more details.
       You should have received a copy of the GNU General Public License along
       with  this  program  (see  the file COPYING); if not, write to the Free
       Software Foundation, Inc., 59 Temple Place  -  Suite  330,  Boston,  MA
       02111-1307, USA

CONTRIBUTORS
       Maarten ter Huurne <maarten@treewalker.org>,
       Jussi Kukkonen <jussi.kukkonen@intel.com>,
       Eric S. Raymond <esr@thyrsus.com>,
       Thomas Renninger <treen@suse.com>,
       Axel Beckert <abe@deuxchevaux.org>,
       Ken Beal <kbeal@amber.ssd.csd.harris.com>,
       Rudolf Koenig <rfkoenig@immd4.informatik.uni-erlangen.de>,
       Toerless Eckert <eckert@immd4.informatik.uni-erlangen.de>,
       Wayne Davison <davison@borland.com>,
       Patrick Wolfe <pat@kai.com, kailand!pat>,
       Bart Schaefer <schaefer@cse.ogi.edu>,
       Nathan Glasser <nathan@brokaw.lcs.mit.edu>,
       Larry W. Virden <lvirden@cas.org>,
       Howard Chu <hyc@hanauma.jpl.nasa.gov>,
       Tim MacKenzie <tym@dibbler.cs.monash.edu.au>,
       Markku Jarvinen <mta@{cc,cs,ee}.tut.fi>,
       Marc Boucher <marc@CAM.ORG>,
       Doug Siebert <dsiebert@isca.uiowa.edu>,
       Ken Stillson <stillson@tsfsrv.mitre.org>,
       Ian Frechett <frechett@spot.Colorado.EDU>,
       Brian Koehmstedt <bpk@gnu.ai.mit.edu>,
       Don Smith <djs6015@ultb.isc.rit.edu>,
       Frank van der Linden <vdlinden@fwi.uva.nl>,
       Martin Schweikert <schweik@cpp.ob.open.de>,
       David Vrona <dave@sashimi.lcu.com>,
       E. Tye McQueen <tye%spillman.UUCP@uunet.uu.net>,
       Matthew Green <mrg@eterna.com.au>,
       Christopher Williams <cgw@pobox.com>,
       Matt Mosley <mattm@access.digex.net>,
       Gregory Neil Shapiro <gshapiro@wpi.WPI.EDU>,
       Johannes Zellner <johannes@zellner.org>,
       Pablo Averbuj <pablo@averbuj.com>.

AVAILABILITY
       The  latest official release of screen available via anonymous ftp from
       ftp.gnu.org/gnu/screen/ or any other GNU distribution  site.  The  home
       site  of  screen  is  savannah.gnu.org/projects/screen/. If you want to
       help, send a note to screen-devel@gnu.org.

BUGS
       ·  `dm' (delete mode) and `xs' are  not  handled  correctly  (they  are
          ignored). `xn' is treated as a magic-margin indicator.

       ·  Screen has no clue about double-high or double-wide characters.  But
          this is the only area where vttest is allowed to fail.

       ·  It is not possible to change the environment variable $TERMCAP  when
          reattaching under a different terminal type.

       ·  The  support of terminfo based systems is very limited. Adding extra
          capabilities to $TERMCAP may not have any effects.

       ·  Screen does not make use of hardware tabs.

       ·  Screen must be installed as set-uid with owner root on most  systems
          in  order to be able to correctly change the owner of the tty device
          file for each window.  Special permission may also  be  required  to
          write the file "/etc/utmp".

       ·  Entries  in  "/etc/utmp"  are not removed when screen is killed with
          SIGKILL.  This will cause some programs  (like  "w"  or  "rwho")  to
          advertise that a user is logged on who really isn't.

       ·  Screen may give a strange warning when your tty has no utmp entry.

       ·  When the modem line was hung up, screen may not automatically detach
          (or quit) unless the device driver is configured to  send  a  HANGUP
          signal.   To  detach  a screen session use the -D or -d command line
          option.

       ·  If a password is set, the command  line  options  -d  and  -D  still
          detach a session without asking.

       ·  Both  "breaktype"  and  "defbreaktype"  change  the break generating
          method used by all terminal devices. The first should change a  win‐
          dow  specific  setting,  where  the  latter  should  change only the
          default for new windows.

       ·  When attaching to a multiuser session, the user's .screenrc file  is
          not  sourced.  Each  user's personal settings have to be included in
          the .screenrc file from which the session is booted, or have  to  be
          changed manually.

       ·  A weird imagination is most useful to gain full advantage of all the
          features.

       ·  Send bug-reports, fixes, enhancements, t-shirts, money, beer & pizza
          to screen-devel@gnu.org.




4th Berkeley Distribution          Feb 2020                          SCREEN(1)
맨 페이지 내용의 저작권은 맨 페이지 작성자에게 있습니다.
RSS ATOM XHTML 5 CSS3