telnet man page on NeXTSTEP

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TELNET(1C)							    TELNET(1C)

NAME
       telnet - user interface to the TELNET protocol

SYNOPSIS
       telnet [ host [ port ] ]

DESCRIPTION
       Telnet  is  used	 to  communicate  with	another	 host using the TELNET
       protocol.  If telnet is invoked without arguments,  it  enters  command
       mode,  indicated	 by  its prompt (“telnet>”).  In this mode, it accepts
       and executes  the  commands  listed  below.   If	 it  is	 invoked  with
       arguments,   it	performs  an  open  command  (see  below)  with	 those
       arguments.

       Once a connection has been opened, telnet enters an  input  mode.   The
       input  mode  entered  will  be either “character at a time” or “line by
       line” depending on what the remote system supports.

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

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

       In  either  mode, if the localchars toggle is TRUE (the default in line
       mode; see below), the user's  quit,  intr,  and	flush  characters  are
       trapped	locally,  and  sent as TELNET protocol sequences to the remote
       side.  There are options (see toggle  autoflush	and  toggle  autosynch
       below)  which  cause  this  action  to  flush  subsequent output to the
       terminal (until the remote host acknowledges the TELNET	sequence)  and
       flush previous terminal input (in the case of quit and intr).

       While connected to a remote host, telnet command mode may be entered by
       typing the telnet “escape character” (initially “^]”).  When in command
       mode, the normal terminal editing conventions are available.

       COMMANDS

       The  following  commands are available.	Only enough of each command to
       uniquely identify it need be typed (this is also true for arguments  to
       the mode, set, toggle, and display commands).

       open host [ port ]
	      Open  a  connection  to  the  named  host.  If no port number is
	      specified, 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(3N)).

       close
	      Close a TELNET session and return to command mode.

       quit
	      Close  any  open TELNET session and exit telnet.	An end of file
	      (in command mode) will also close a session and exit.

       z
	      Suspend telnet.  This command only works when the user is	 using
	      the csh(1).

       mode type
	      Type  is either line (for “line by line” mode) or character (for
	      “character at a time” mode).   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.

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

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

       ? [ command ]
	      Get help.	 With no arguments, telnet prints a help summary.   If
	      a	 command  is specified, telnet will print the help information
	      for just that command.

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

	      escape
		     Sends the	current	 telnet	 escape	 character  (initially
		     “^]”).

	      synch
		     Sends  the	 TELNET	 SYNCH sequence.  This sequence causes
		     the remote system to discard all  previously  typed  (but
		     not yet read) input.  This sequence is sent as TCP urgent
		     data (and may not work if the remote system is a 4.2  BSD
		     system  --	 if  it	 doesn't work, a lower case “r” may be
		     echoed on the terminal).

	      brk
		     Sends the TELNET BRK (Break)  sequence,  which  may  have
		     significance to the remote system.

	      ip
		     Sends  the	 TELNET IP (Interrupt Process) sequence, which
		     should cause the remote system  to	 abort	the  currently
		     running process.

	      ao
		     Sends the TELNET AO (Abort Output) sequence, which should
		     cause the remote system to	 flush	all  output  from  the
		     remote system to the user's terminal.

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

	      ec
		     Sends the TELNET EC  (Erase  Character)  sequence,	 which
		     should   cause  the  remote  system  to  erase  the  last
		     character entered.

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

	      ga
		     Sends the TELNET GA (Go Ahead) sequence, which likely has
		     no significance to the remote system.

	      nop
		     Sends the TELNET NOP (No OPeration) sequence.

	      ?
		     Prints out help information for the send command.

       set argument value
	      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 display command.  The variables which may be specified are:

	      echo
		     This is the value (initially “^E”) which, when  in	 “line
		     by	 line”	mode,  toggles	between doing local echoing of
		     entered   characters   (for   normal   processing),   and
		     suppressing  echoing of entered characters (for entering,
		     say, a password).

	      escape
		     This is the  telnet  escape  character  (initially	 “^[”)
		     which   causes  entry  into  telnet  command  mode	 (when
		     connected to a remote system).

	      interrupt
		     If telnet is in localchars mode  (see  toggle  localchars
		     below)  and the interrupt character is typed, a TELNET IP
		     sequence (see send ip above) 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  (see  toggle  localchars
		     below)  and  the  quit  character	is typed, a TELNET BRK
		     sequence (see send brk above) 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  (see  toggle  localchars
		     below)  and  the flushoutput character is typed, a TELNET
		     AO sequence (see send ao above) 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  (see  toggle  localchars
		     below),  and  if  telnet  is operating in “character at a
		     time” mode, then when this character is typed,  a	TELNET
		     EC	 sequence  (see	 send  ec above) is sent to the remote
		     system.  The initial value for  the  erase	 character  is
		     taken to be the terminal's erase character.

	      kill
		     If	 telnet	 is  in localchars mode (see toggle localchars
		     below), and if telnet is operating	 in  “character	 at  a
		     time”  mode,  then when this character is typed, a TELNET
		     EL sequence (see send el above) is	 sent  to  the	remote
		     system.   The  initial  value  for	 the kill character is
		     taken to be the terminal's kill character.

	      eof
		     If telnet is operating in “line by line”  mode,  entering
		     this  character  as  the  first  character on a line will
		     cause this character to be sent  to  the  remote  system.
		     The initial value of the eof character is taken to be the
		     terminal's eof character.

       toggle arguments...
	      Toggle (between TRUE and FALSE) 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 command.  Valid arguments are:

	      localchars
		     If	 this is TRUE, then the flush, interrupt, quit, erase,
		     and  kill	characters  (see  set  above)  are  recognized
		     locally,  and  transformed	 into  (hopefully) appropriate
		     TELNET control sequences (respectively ao, ip,  brk,  ec,
		     and  el;  see  send  above).   The initial value for this
		     toggle is TRUE in “line  by  line”	 mode,	and  FALSE  in
		     “character at a time” mode.

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

	      autosynch
		     If	 autosynch  and	 localchars  are  both TRUE, then when
		     either the intr or quit  characters  is  typed  (see  set
		     above  for descriptions of the intr and quit characters),
		     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.

	      crmod
		     Toggle  carriage return mode.  When this mode is enabled,
		     most carriage return characters received from the	remote
		     host  will be mapped into a carriage 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 not very  useful  unless  the	remote
		     host  only	 sends	carriage  return, but never line feed.
		     The initial value for this toggle is FALSE.

	      debug
		     Toggles  socket  level  debugging	(useful	 only  to  the
		     superuser).  The initial value for this toggle is FALSE.

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

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

	      ?
		     Displays the legal toggle commands.

BUGS
       There is no adequate way for dealing with flow control.

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

       There is enough settable state to justify a .telnetrc file.

       No capability for a .telnetrc file is provided.

       In “line by line” mode, the terminal's eof character is only recognized
       (and sent to the remote system) when it is the  first  character	 on  a
       line.

       There  can  be  a  loss	of  characters or improper handling of special
       characters (e.g., carriage returns and  line  feeds)  during  a	telnet
       session from a local non-NEXTSTEP host to a remote NEXTSTEP host.  This
       can be fixed by using the stty -extproc on  the	remote	NEXTSTEP  host
       you're  logged  into (either from the command line or adding it to your
       .login file). This causes characters to be processed  external  to  the
       terminal driver.

4.2 Berkeley Distribution	 May 10, 1986			    TELNET(1C)
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