+will print the help information for just that command.
+.TP
+.B send \fIarguments\fP
+.br
+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):
+.RS
+.TP
+.I escape
+.br
+Sends the current
+.I telnet
+escape character (initially \*(lq^]\*(rq).
+.TP
+.I synch
+.br
+Sends the
+.B 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 \*(lqr\*(rq may be echoed on the terminal).
+.TP
+.I brk
+.br
+Sends the
+.B TELNET BRK
+(Break) sequence, which may have significance to the remote
+system.
+.TP
+.I ip
+.br
+Sends the
+.B TELNET IP
+(Interrupt Process) sequence, which should cause the remote
+system to abort the currently running process.
+.TP
+.I ao
+.br
+Sends the
+.B TELNET AO
+(Abort Output) sequence, which should cause the remote system to flush
+all output
+.B from
+the remote system
+.B to
+the user's terminal.
+.TP
+.I ayt
+.br
+Sends the
+.B TELNET AYT
+(Are You There)
+sequence, to which the remote system may or may not choose to respond.
+.TP
+.I ec
+.br
+Sends the
+.B TELNET EC
+(Erase Character)
+sequence, which should cause the remote system to erase the last character
+entered.
+.TP
+.I el
+.br
+Sends the
+.B TELNET EL
+(Erase Line)
+sequence, which should cause the remote system to erase the line currently
+being entered.
+.TP
+.I ga
+.br
+Sends the
+.B TELNET GA
+(Go Ahead)
+sequence, which likely has no significance to the remote system.
+.TP
+.I nop
+.br
+Sends the
+.B TELNET NOP
+(No OPeration)
+sequence.
+.TP
+.I ?
+.br
+Prints out help information for the
+.B send
+command.
+.RE
+.TP
+.B set \fIargument value\fP
+.br
+Set any one of a number of
+.I telnet
+variables to a specific value.
+The special value \*(lqoff\*(rq turns off the function associated with
+the variable.
+The values of variables may be interrogated with the
+.B display
+command.
+The variables which may be specified are:
+.RS
+.TP
+.I echo
+.br
+This is the value (initially \*(lq^E\*(rq) which, when in
+\*(lqline by line\*(rq mode, toggles between doing local echoing
+of entered characters (for normal processing), and suppressing
+echoing of entered characters (for entering, say, a password).
+.TP
+.I escape
+.br
+This is the
+.I telnet
+escape character (initially \*(lq^[\*(rq) which causes entry
+into
+.I telnet
+command mode (when connected to a remote system).
+.TP
+.I interrupt
+.br
+If
+.I telnet
+is in
+.I localchars
+mode (see
+.B toggle
+.I localchars
+below)
+and the
+.I interrupt
+character is typed, a
+.B TELNET IP
+sequence (see
+.B send
+.I ip
+above)
+is sent to the remote host.
+The initial value for the interrupt character is taken to be
+the terminal's
+.B intr
+character.
+.TP
+.I quit
+.br
+If
+.I telnet
+is in
+.I localchars
+mode (see
+.B toggle
+.I localchars
+below)
+and the
+.I quit
+character is typed, a
+.B TELNET BRK
+sequence (see
+.B send
+.I brk
+above)
+is sent to the remote host.
+The initial value for the quit character is taken to be
+the terminal's
+.B quit
+character.
+.TP
+.I flushoutput
+.br
+If
+.I telnet
+is in
+.I localchars
+mode (see
+.B toggle
+.I localchars
+below)
+and the
+.I flushoutput
+character is typed, a
+.B TELNET AO
+sequence (see
+.B send
+.I ao
+above)
+is sent to the remote host.
+The initial value for the flush character is taken to be
+the terminal's
+.B flush
+character.
+.TP
+.I erase
+.br
+If
+.I telnet
+is in
+.I localchars
+mode (see
+.B toggle
+.I localchars
+below),
+.B and
+if
+.I telnet
+is operating in \*(lqcharacter at a time\*(rq mode, then when this
+character is typed, a
+.B TELNET EC
+sequence (see
+.B send
+.I ec
+above)
+is sent to the remote system.
+The initial value for the erase character is taken to be
+the terminal's
+.B erase
+character.
+.TP
+.I kill
+.br
+If
+.I telnet
+is in
+.I localchars
+mode (see
+.B toggle
+.I localchars
+below),
+.B and
+if
+.I telnet
+is operating in \*(lqcharacter at a time\*(rq mode, then when this
+character is typed, a
+.B TELNET EL
+sequence (see
+.B send
+.I el
+above)
+is sent to the remote system.
+The initial value for the kill character is taken to be
+the terminal's
+.B kill
+character.
+.TP
+.I eof
+.br
+If
+.I telnet
+is operating in \*(lqline by line\*(rq 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
+.B eof
+character.
+.RE
+.TP
+.B toggle \fIarguments...\fP
+.br
+Toggle (between
+TRUE
+and
+FALSE)
+various flags that control how
+.I telnet
+responds to events.
+More than one argument may be specified.
+The state of these flags may be interrogated with the
+.B display
+command.
+Valid arguments are:
+.RS
+.TP
+.I localchars
+.br
+If this is
+TRUE,
+then the
+.IR flush ,
+.IR interrupt ,
+.IR quit ,
+.IR erase ,
+and
+.I kill
+characters (see
+.B set
+above) are recognized locally, and transformed into (hopefully) appropriate
+.B TELNET
+control sequences
+(respectively
+.IR ao ,
+.IR ip ,
+.IR brk ,
+.IR ec ,
+and
+.IR el ;
+see
+.B send
+above).
+The initial value for this toggle is TRUE in \*(lqline by line\*(rq mode,
+and FALSE in \*(lqcharacter at a time\*(rq mode.
+.TP
+.I autoflush
+.br
+If
+.I autoflush
+and
+.I localchars
+are both
+TRUE,
+then when the
+.IR ao ,
+.IR intr ,
+or
+.I quit
+characters are recognized (and transformed into
+.B TELNET
+sequences; see
+.B set
+above for details),
+.I telnet
+refuses to display any data on the user's terminal
+until the remote system acknowledges (via a
+.B TELNET
+.I Timing Mark
+option)
+that it has processed those
+.B TELNET
+sequences.
+The initial value for this toggle is TRUE if the terminal user had not
+done an "stty noflsh", otherwise FALSE (see
+.IR stty(1)).
+.TP
+.I autosynch
+If
+.I autosynch
+and
+.I localchars
+are both
+TRUE,
+then when either the
+.I intr
+or
+.I quit
+characters is typed (see
+.B set
+above for descriptions of the
+.I intr
+and
+.I quit
+characters), the resulting
+.B TELNET
+sequence sent is followed by the
+.B TELNET SYNCH
+sequence.
+This procedure
+.B should
+cause the remote system to begin throwing away all previously
+typed input until both of the
+.B TELNET
+sequences have been read and acted upon.
+The initial value of this toggle is FALSE.
+.TP
+.I crmod
+.br
+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.
+.TP
+.I debug
+.br
+Toggles socket level debugging (useful only to the
+.IR super user ).
+The initial value for this toggle is FALSE.
+.TP
+.I options
+.br
+Toggles the display of some internal
+.I telnet
+protocol processing (having to do with
+.B TELNET
+options).
+The initial value for this toggle is FALSE.
+.TP
+.I netdata
+.br
+Toggles the display of all network data (in hexadecimal format).
+The initial value for this toggle is FALSE.
+.TP
+.I ?
+.br
+Displays the legal
+.B toggle
+commands.
+.RE
projects / unix-history / blobdiff