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telnet(1)

telnet(1)                        User Commands                       telnet(1)



NAME
       telnet - user interface to a remote system using the TELNET protocol

SYNOPSIS
       telnet [-8EFKLacdfrx] [-X atype] [-e escape_char]
            [-k realm] [-l user] [-n file]
            [ [ [!] @hop1 [@hop2...] @] host [port]]

DESCRIPTION
       The telnet utility communicates with another host using the TELNET pro‐
       tocol. If telnet is invoked without arguments, it enters command  mode,
       indicated by its prompt, telnet>. In this mode, it accepts and executes
       its associated commands. See USAGE. If it is invoked with arguments, it
       performs an open command with those arguments.


       If, for example, a host is specified as @hop1@hop2@host, the connection
       goes through hosts hop1 and hop2, using loose source routing to end  at
       host.  If  a  leading  !  is used, the connection follows strict source
       routing. Notice that when telnet uses  IPv6,  it  can  only  use  loose
       source routing, and the connection ignores the !.


       Once  a  connection  has been opened, telnet enters input mode. In this
       mode, text typed is sent to the remote host.  The  input  mode  entered
       will  be  either  "line  mode",  "character at a time", or "old line by
       line", depending upon what the remote system supports.


       In "line mode", character processing is done on the local system, under
       the control of the remote system. When input editing or character echo‐
       ing is to be disabled, the remote system will relay  that  information.
       The  remote  system  will  also relay changes to any special characters
       that happen on the remote system, so that they can take effect  on  the
       local system.


       In  "character  at a time" mode, most text typed is immediately sent to
       the remote host for processing.


       In "old line by line" mode, all text is echoed locally, and  (normally)
       only completed lines are sent to the remote host. The "local echo char‐
       acter" (initially ^E) may be used to turn off and on  the  local  echo.
       (Use  this  mostly  to  enter  passwords  without  the  password  being
       echoed.).


       If the "line mode" option is enabled, or if the  localchars  toggle  is
       TRUE  (the  default in "old line by line" mode), the user's quit, intr,
       and flush characters are trapped locally, and sent as  TELNET  protocol
       sequences  to  the  remote  side. If "line mode" has ever been enabled,
       then the  user's  susp  and  eof  are  also  sent  as  TELNET  protocol
       sequences.  quit  is  then sent as a TELNET ABORT instead of BREAK. The
       options toggle  autoflush and toggle  autosynch cause  this  action  to
       flush subsequent output to the terminal (until the remote host acknowl‐
       edges the TELNET sequence); and to flush previous  terminal  input,  in
       the case of quit and intr.


       While  connected  to  a  remote host, the user can enter telnet command
       mode by typing the telnet escape character (initially ^]). When in com‐
       mand  mode,  the  normal  terminal  editing  conventions are available.
       Pressing RETURN at the telnet command prompt causes telnet to exit com‐
       mand mode.

OPTIONS
       The following options are supported:

       -8

           Specifies  an 8-bit data path. Negotiating the TELNET BINARY option
           is attempted for both input and output.


       -a

           Attempts automatic login. This sends the user name by means of  the
           USER  variable  of  the  ENVIRON option, if supported by the remote
           system. The name used is that of the current user  as  returned  by
           getlogin(3C)  if  it agrees with the current user ID. Otherwise, it
           is the name associated with the user ID.


       -c

           Disables the reading of the user's telnetrc file. (See  the  toggle
           skiprc command on this reference page.)


       -d

           Sets the initial value of the debug toggle to TRUE.


       -e escape_char

           Sets  the  initial escape character to escape_char. escape_char may
           also be a two character sequence consisting of ^ (Control key) fol‐
           lowed by one character. If the second character is ?, the DEL char‐
           acter is selected. Otherwise, the second character is converted  to
           a   control   character  and  used  as  the  escape  character.  If
           escape_char is defined as the null string (that is, -e   ''),  this
           is  equivalent to -e '^@' (Control-@). To specify that no character
           can be the escape character, use the -E option.


       -E

           Stops any character from being recognized as an escape character.


       -l user

           When connecting to a remote system  that  understands  the  ENVIRON
           option,  then  user  will be sent to the remote system as the value
           for the ENVIRON variable USER.


       -L

           Specifies an 8-bit data path on  output.  This  causes  the  BINARY
           option to be negotiated on output.


       -n tracefile

           Opens  tracefile  for  recording  trace  information.  See  the set
           tracefile command below.


       -r

           Specifies a user interface similar to rlogin.  In  this  mode,  the
           escape character is set to the tilde (~) character, unless modified
           by the -e option. The rlogin escape character  is  only  recognized
           when  it is preceded by a carriage return. In this mode, the telnet
           escape character, normally '^]', must still precede a  telnet  com‐
           mand.  The rlogin escape character can also be followed by '.\r' or
           '^Z', and, like  rlogin(1),  closes  or  suspends  the  connection,
           respectively.  This  option  is  an  uncommitted  interface and may
           change in the future.


       -X atype

           Disables the atype type of authentication.


USAGE
   telnet Commands
       The commands described in this section are available with telnet. It is
       necessary  to type only enough of each command to uniquely identify it.
       (This is also true for arguments to the mode, set, toggle, unset, envi‐
       ron, and display commands.)

       auth argument ...

           The  auth command manipulates the information sent through the TEL‐
           NET  AUTHENTICATE option. Valid arguments for the auth command  are
           as follows:

           disable type

               Disables the specified type of authentication. To obtain a list
               of available types, use the auth  disable ? command.


           enable type

               Enables the specified type of authentication. To obtain a  list
               of available types, use the auth  enable ? command.


           status

               Lists  the  current  status of the various types of authentica‐
               tion.



       open [-l user ] [ [!] @hop1 [@hop2 ...]@host [ port ]

           Open a connection to the named host. If no port  number  is  speci‐
           fied, telnet will attempt to contact a TELNET server at the default
           port. The host  specification  may  be  either  a  host  name  (see
           hosts(5))  or  an  Internet address specified in the "dot notation"
           (see  inet(4P)  or  inet6(4P)).  If  the  host  is   specified   as
           @hop1@hop2@host,  the  connection goes through hosts hop1 and hop2,
           using loose source routing to end at host. The @ symbol is required
           as  a separator between the hosts specified. If a leading ! is used
           with IPv4, the connection follows strict source routing.

           The -l option passes the user as the value of the ENVIRON  variable
           USER to the remote system.


       close

           Close  any  open TELNET session. An EOF (in command mode) will also
           close a session and exit.


       encrypt

           The encrypt command manipulates the information  sent  through  the
           TELNET  ENCRYPT option.

           Valid arguments for the encrypt command are as follows:

           disable type [input|output]

               Disables  the  specified  type  of  encryption. If you omit the
               input and output, both input and output are disabled. To obtain
               a list of available types, use the encrypt  disable ? command.


           enable type [input|output]

               Enables the specified type of encryption. If you omit input and
               output, both input and output are enabled. To obtain a list  of
               available types, use the encrypt  enable ? command.


           input

               This is the same as the encrypt  start input command.


           -input

               This is the same as the encrypt  stop input command.


           output

               This is the same as the encrypt  start output command.


           -output

               This is the same as the encrypt  stop output command.


           start [input|output]

               Attempts  to  start  encryption.  If you omit input and output,
               both input and output are enabled. To obtain a list  of  avail‐
               able types, use the encrypt  enable ? command.


           status

               Lists the current status of encryption.


           stop [input|output]

               Stops  encryption.  If you omit input and output, encryption is
               on both input and output.


           type type

               Sets the default type of  encryption  to  be  used  with  later
               encrypt  start or encrypt  stop commands.



       quit

           Same as close.


       z

           Suspend  telnet.  This  command only works when the user is using a
           shell that supports job control, such as sh(1).


       mode type

           The remote host is asked for permission to go  into  the  requested
           mode.  If  the  remote  host  is capable of entering that mode, the
           requested mode will be entered. The argument type  is  one  of  the
           following:

           character

               Disable the TELNET LINEMODE option, or, if the remote side does
               not understand the LINEMODE option, then enter "character at  a
               time" mode.


           line

               Enable  the TELNET LINEMODE option, or, if the remote side does
               not understand the LINEMODE option, then attempt to enter "old-
               line-by-line" mode.


           isig (-isig)

               Attempt  to  enable  (disable) the TRAPSIG mode of the LINEMODE
               option. This requires that the LINEMODE option be enabled.


           edit (-edit)

               Attempt to enable (disable)  the  EDIT  mode  of  the  LINEMODE
               option. This requires that the LINEMODE option be enabled.


           softtabs (-softtabs)

               Attempt  to  enable (disable) the SOFT_TAB mode of the LINEMODE
               option. This requires that the LINEMODE option be enabled.


           litecho (-litecho)

               Attempt to enable (disable) the LIT_ECHO mode of  the  LINEMODE
               option. This requires that the LINEMODE option be enabled.


           ?

               Prints out help information for the mode command.



       status

           Show  the  current  status of telnet. This includes the peer one is
           connected to, as well as the current mode.


       display

           [argument...] Display all, or some, of the set  and  toggle  values
           (see toggle  argument...).


       ?

           [command]  Get  help.  With no arguments, telnet prints a help sum‐
           mary. If a command is specified, telnet will print the help  infor‐
           mation for just that command.


       send argument...

           Send  one  or  more special character sequences to the remote host.
           The following are the arguments that can be  specified  (more  than
           one argument may be specified at a time):

           escape

               Send the current telnet escape character (initially ^]).


           synch

               Send the TELNET SYNCH sequence. This sequence discards all pre‐
               viously typed, but not yet read, input on  the  remote  system.
               This  sequence  is  sent as TCP urgent data and may not work if
               the remote system is a 4.2 BSD system. If it does not  work,  a
               lowercase "r" may be echoed on the terminal.


           brk or break

               Send  the  TELNET BRK (Break) sequence, which may have signifi‐
               cance to the remote system.


           ip

               Send the TELNET IP (Interrupt Process) sequence,  which  aborts
               the currently running process on the remote system.


           abort

               Send the TELNET ABORT (Abort Process) sequence.


           ao

               Send  the  TELNET AO (Abort Output) sequence, which flushes all
               output from the remote system to the user's terminal.


           ayt

               Send the TELNET AYT (Are You  There)  sequence,  to  which  the
               remote system may or may not respond.


           ec

               Send the TELNET EC (Erase Character) sequence, which erases the
               last character entered.


           el

               Send the TELNET EL (Erase Line) sequence,  which  should  cause
               the remote system to erase the line currently being entered.


           eof

               Send the TELNET EOF (End Of File) sequence.


           eor

               Send the TELNET EOR (End Of Record) sequence.


           ga

               Send  the  TELNET GA (Go Ahead) sequence, which probably has no
               significance for the remote system.


           getstatus

               If the remote side supports the TELNET STATUS command,  getsta‐
               tus  will  send  the  subnegotiation to request that the server
               send its current option status.


           nop

               Send the TELNET NOP (No Operation) sequence.


           susp

               Send the TELNET SUSP (Suspend Process) sequence.


           do option
           dont option
           will option
           wont option

               Send the TELNET protocol option negotiation  indicated.  Option
               may be the text name of the protocol option, or the number cor‐
               responding to the option. The command will be silently  ignored
               if the option negotiation indicated is not valid in the current
               state. If the option is given as help or ?, the list of  option
               names  known  is  listed.  This  command  is  mostly useful for
               unusual debugging situations.





           ?

               Print out help information for the send command.



       set argument [value]
       unset argument

           Set any one of a number of telnet variables to  a  specific  value.
           The  special  value  off turns off the function associated with the
           variable. The values of variables may be interrogated with the dis‐
           play  command.  If value is omitted, the value is taken to be true,
           or "on". If the unset form is used, the value is taken to be false,
           or off. The variables that may be specified are:

           echo

               This  is  the value (initially ^E) that, when in "line by line"
               mode, toggles between local echoing of entered  characters  for
               normal  processing,  and suppressing echoing of entered charac‐
               ters, for example, entering a password.


           escape

               This is the telnet escape character (initially ^]) that  enters
               telnet command mode when connected to a remote system.


           interrupt

               If  telnet  is  in localchars mode (see toggle, localchars) and
               the interrupt character is typed, a  TELNET  IP  sequence  (see
               send  and ip) is sent to the remote host. The initial value for
               the interrupt character is taken  to  be  the  terminal's  intr
               character.


           quit

               If  telnet  is  in  localchars  mode  and the quit character is
               typed, a TELNET BRK sequence (see send, brk)  is  sent  to  the
               remote  host. The initial value for the quit character is taken
               to be the terminal's quit character.


           flushoutput

               If telnet is in localchars mode and the  flushoutput  character
               is  typed,  a  TELNET AO sequence (see send, ao) is sent to the
               remote host. The initial value for the flush character is taken
               to be the terminal's flush character.


           erase

               If  telnet is in localchars mode and operating in "character at
               a time" mode, then when the erase character is typed, a  TELNET
               EC  sequence  (see  send, ec) is sent to the remote system. The
               initial value for the erase character is taken to be the termi‐
               nal's erase character.


           kill

               If  telnet is in localchars mode and operating in "character at
               a time" mode, then when the kill character is typed,  a  TELNET
               EL  sequence  (see  send, el) is sent to the remote system. The
               initial value for the kill character is taken to be the  termi‐
               nal's kill character.


           eof

               If  telnet  is  operating in "line by line"/ mode, entering the
               eof character as the first character on a line sends this char‐
               acter  to  the remote system. The initial value of eof is taken
               to be the terminal's eof character.


           ayt

               If telnet is in localchars mode, or LINEMODE  is  enabled,  and
               the  status  character is typed, a TELNET AYT ("Are You There")
               sequence is sent to the remote host. (See send, ayt above.) The
               initial value for ayt is the terminal's status character.


           forw1
           forw2

               If  telnet  is  operating  in  LINEMODE, and the forw1 or forw2
               characters are typed, this causes  the  forwarding  of  partial
               lines to the remote system. The initial values for the forward‐
               ing characters come from the terminal's eol  and  eol2  charac‐
               ters.



           lnext

               If  telnet is operating in LINEMODE or "old line by line" mode,
               then the lnext character is assumed to be the terminal's  lnext
               character.  The  initial value for the lnext character is taken
               to be the terminal's lnext character.


           reprint

               If telnet is operating in LINEMODE or "old line by line"  mode,
               then  the reprint character is assumed to be the terminal's re‐
               print character. The initial value for reprint is taken  to  be
               the terminal's reprint character.


           rlogin

               This  is the rlogin escape character. If set, the normal telnet
               escape character is ignored, unless  it  is  preceded  by  this
               character  at the beginning of a line. The rlogin character, at
               the beginning of a line followed by a "."  closes  the  connec‐
               tion.  When  followed  by a ^Z, the rlogin command suspends the
               telnet command. The initial state  is  to  disable  the  rlogin
               escape character.


           start

               If the TELNET TOGGLE-FLOW-CONTROL option has been enabled, then
               the start character is taken to be the terminal's start charac‐
               ter.  The  initial  value for the kill character is taken to be
               the terminal's start character.


           stop

               If the TELNET TOGGLE-FLOW-CONTROL option has been enabled, then
               the  stop  character is taken to be the terminal's stop charac‐
               ter. The initial value for the kill character is  taken  to  be
               the terminal's stop character.


           susp

               If  telnet  is  in localchars mode, or LINEMODE is enabled, and
               the suspend character is typed, a  TELNET  SUSP  sequence  (see
               send, susp above) is sent to the remote host. The initial value
               for the suspend character is taken to be the terminal's suspend
               character.


           tracefile

               This  is  the file to which the output, generated when the net‐
               data or the debug option is TRUE, will be written. If tracefile
               is  set  to  "-",  then  tracing information will be written to
               standard output (the default).


           worderase

               If telnet is operating in LINEMODE or "old line by line"  mode,
               then  this  character  is  taken to be the terminal's worderase
               character. The initial value for  the  worderase  character  is
               taken to be the terminal's worderase character.


           ?

               Displays the legal set and unset commands.




       slc state

           The slc (Set Local Characters) command is used to set or change the
           state of special characters when the  TELNET  LINEMODE  option  has
           been  enabled. Special characters are characters that get mapped to
           TELNET commands sequences (like ip or quit) or line editing charac‐
           ters  (like  erase and kill). By default, the local special charac‐
           ters are exported. The following values for state are valid:

           check

               Verifies the settings for the current special  characters.  The
               remote  side is requested to send all the current special char‐
               acter settings. If there are any discrepancies with  the  local
               side, the local settings will switch to the remote values.


           export

               Switches  to the local defaults for the special characters. The
               local default characters are those of the local terminal at the
               time when telnet was started.


           import

               Switches to the remote defaults for the special characters. The
               remote default characters are those of the remote system at the
               time when the TELNET connection was established.


           ?

               Prints out help information for the slc command.



       toggle argument...

           Toggle  between  TRUE  and FALSE the various flags that control how
           telnet responds to events. More than one argument may be specified.
           The  state of these flags may be interrogated with the display com‐
           mand. Valid arguments are:

           authdebug           Turns on debugging information for the  authen‐
                               tication code.


           autodecrypt         When  the TELNET  ENCRYPT option is negotiated,
                               by default the actual  encryption  (decryption)
                               of  the  data  stream  does not start automati‐
                               cally. The  autoencrypt  (autodecrypt)  command
                               states  that  encryption  of the output (input)
                               stream should be enabled as soon as possible.


           autologin           If the remote side supports the TELNET  AUTHEN‐
                               TICATION  option,  telnet attempts to use it to
                               perform  automatic   authentication.   If   the
                               AUTHENTICATION  option  is  not  supported, the
                               user's login name  is  propagated  through  the
                               TELNET   ENVIRON  option.  This  command is the
                               same as specifying the -a option  on  the  open
                               command.


           autoflush           If autoflush and localchars are both TRUE, then
                               when the ao, intr, or quit characters are  rec‐
                               ognized (and transformed into TELNET sequences;
                               see set for details), telnet refuses to display
                               any  data  on  the  user's  terminal  until the
                               remote system acknowledges (using a TELNET Tim‐
                               ing  Mark  option)  that it has processed those
                               TELNET sequences. The initial  value  for  this
                               toggle  is  TRUE  if  the terminal user has not
                               done an "stty noflsh". Otherwise, the value  is
                               FALSE (see stty(1)).


           autosynch           If autosynch and localchars are both TRUE, then
                               when either the interrupt  or  quit  characters
                               are  typed  (see set for descriptions of inter‐
                               rupt and quit), the resulting  TELNET  sequence
                               sent  is followed by the TELNET SYNCH sequence.
                               This procedure should cause the  remote  system
                               to  begin  throwing  away  all previously typed
                               input until both of the TELNET  sequences  have
                               been  read and acted upon. The initial value of
                               this toggle is FALSE.


           binary              Enable or disable the TELNET BINARY  option  on
                               both input and output.


           inbinary            Enable  or  disable the TELNET BINARY option on
                               input.


           outbinary           Enable or disable the TELNET BINARY  option  on
                               output.


           crlf                Determines  how  carriage  returns are sent. If
                               the value is TRUE, then carriage  returns  will
                               be  sent  as  <CR><LF>.  If the value is FALSE,
                               then  carriage  returns   will   be   send   as
                               <CR><NUL>. The initial value for this toggle is
                               FALSE.


           crmod               Toggle RETURN mode. When this mode is  enabled,
                               most RETURN characters received from the remote
                               host will be mapped into a RETURN followed by a
                               line  feed.  This  mode  does  not affect those
                               characters  typed  by  the  user,  only   those
                               received  from  the  remote  host. This mode is
                               useful only for remote hosts that  send  RETURN
                               but  never send LINEFEED. The initial value for
                               this toggle is FALSE.


           debug               Toggle socket level debugging  (only  available
                               to  the super-user). The initial value for this
                               toggle is FALSE.


           encdebug            Turns on debugging information for the  encryp‐
                               tion code.


           localchars          If  this toggle is TRUE, then the flush, inter‐
                               rupt, quit, erase,  and  kill  characters  (see
                               set)  are  recognized  locally, and transformed
                               into  appropriate  TELNET  control   sequences,
                               respectively  ao,  ip,  brk,  ec,  and  el (see
                               send). The initial value  for  this  toggle  is
                               TRUE  in  "line  by  line"  mode,  and FALSE in
                               "character at a time" mode. When  the  LINEMODE
                               option  is  enabled, the value of localchars is
                               ignored, and assumed  always  to  be  TRUE.  If
                               LINEMODE  has  ever  been enabled, then quit is
                               sent as abort, and eof and suspend are sent  as
                               eof and susp (see send above).


           netdata             Toggle  the  display  of  all  network data (in
                               hexadecimal format). The initial value for this
                               toggle is FALSE.


           options             Toggle the display of some internal TELNET pro‐
                               tocol processing  (having  to  do  with  telnet
                               options).  The initial value for this toggle is
                               FALSE.


           prettydump          When the netdata toggle is enabled, if  pretty‐
                               dump  is  enabled,  the output from the netdata
                               command will be formatted in a more user  read‐
                               able  format. Spaces are put between each char‐
                               acter in the output. The beginning of any  TEL‐
                               NET  escape sequence is preceded by an asterisk
                               (*) to aid in locating them.


           skiprc              When the skiprc toggle is  TRUE,  TELNET  skips
                               the reading of the .telnetrc file in the user's
                               home directory when connections are opened. The
                               initial value for this toggle is FALSE.


           termdata            Toggles  the  display  of all terminal data (in
                               hexadecimal format). The initial value for this
                               toggle is FALSE.


           verbose_encrypt     When  the  verbose_encrypt flag is TRUE, TELNET
                               prints out a message each  time  encryption  is
                               enabled or disabled. The initial value for this
                               toggle is FALSE.


           ?                   Display the legal toggle commands.



       environ argument...

           The environ command is used to manipulate  variables  that  may  be
           sent  through  the  TELNET ENVIRON option. The initial set of vari‐
           ables is taken from the users environment.  Only  the  DISPLAY  and
           PRINTER  variables are exported by default. Valid arguments for the
           environ command are:

           define variable value

               Define variable to have a value of value. Any variables defined
               by  this  command  are automatically exported. The value may be
               enclosed in single or double quotes, so that  tabs  and  spaces
               may be included.


           undefine variable

               Remove variable from the list of environment variables.


           export variable

               Mark the variable to be exported to the remote side.


           unexport variable

               Mark   the  variable  to  not  be  exported  unless  explicitly
               requested by the remote side.


           list

               List the current set of  environment  variables.  Those  marked
               with  an  asterisk  (*) will be sent automatically. Other vari‐
               ables will be sent only if explicitly requested.


           ?

               Prints out help information for the environ command.



       logout

           Sends the telnet logout option to the remote side. This command  is
           similar  to  a  close command. However, if the remote side does not
           support the logout option, nothing happens. If, however, the remote
           side  does support the logout option, this command should cause the
           remote side to close the TELNET connection. If the remote side also
           supports the concept of suspending a user's session for later reat‐
           tachment, the logout argument indicates that the remote side should
           terminate the session immediately.


FILES
       $HOME/.telnetrc    file  that  contains  commands to be executed before
                          initiating a telnet session


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE VALUE _ Availabilitynetwork/telnet


SEE ALSO
       rlogin(1), sh(1), stty(1), getlogin(3C), inet(4P), inet6(4P), hosts(5),
       nologin(5), telnetrc(5), attributes(7)

DIAGNOSTICS
       NO LOGINS: System going down in N minutes

           The machine is in the process of being shut down  and  logins  have
           been disabled.


NOTES
       On  some  remote  systems,  echo  has to be turned off manually when in
       "line by line" mode.


       In "old line by line" mode, or LINEMODE, the terminal's  EOF  character
       is only recognized (and sent to the remote system) when it is the first
       character on a line.


       The telnet protocol only uses single DES for session protection—clients
       request service tickets with single DES session keys. The KDC must know
       that host service principals that offer the telnet service support sin‐
       gle  DES, which, in practice, means that such principals must have sin‐
       gle DES keys in the KDC database.



Oracle Solaris 11.4               20 Jun 2016                        telnet(1)
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