telnet.1

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.Nm telnet
is operating in
.Li LINEMODE
or \*(Lqold line by line\*(Lq mode, then this character is taken to
be the terminal's
.Ic lnext
character.
The initial value for the lnext character is taken to be
the terminal's
.Ic lnext
character.
.Tp Ic quit
If
.Nm telnet
is in
.Ic localchars
mode (see
.Ic toggle
.Ic localchars
below)
and the
.Ic quit
character is typed, a
.Li TELNET BRK
sequence (see
.Ic send
.Ic brk
above)
is sent to the remote host.
The initial value for the quit character is taken to be
the terminal's
.Ic quit
character.
.Tp Ic reprint
If
.Nm telnet
is operating in
.Li LINEMODE
or \*(Lqold line by line\*(Lq mode, then this character is taken to
be the terminal's
.Ic reprint
character.
The initial value for the reprint character is taken to be
the terminal's
.Ic reprint
character.
.Tp Ic rlogin
This is the rlogin escape character.
If set, the normal
.Nm telnet
.Ic escape
character will be ignored unless it is preceded by this character
at the beginning of a line.
This character, at the beginning of a line, followed by a ``.''
will close the connection; when followed by a ``^Z'' it will
suspend the
.Nm telnet
command.
The initial state is to have the
.Ic rlogin
escape character disabled.
.Tp Ic start
If the
.Li TELNET TOGGLE-FLOW-CONTROL
option has been enabled,
then this character is taken to
be the terminal's
.Ic start
character.
The initial value for the kill character is taken to be
the terminal's
.Ic start
character.
.Tp Ic stop
If the
.Li TELNET TOGGLE-FLOW-CONTROL
option has been enabled,
then this character is taken to
be the terminal's
.Ic stop
character.
The initial value for the kill character is taken to be
the terminal's
.Ic stop
character.
.Tp Ic susp
If
.Nm telnet
is in
.Ic localchars
mode, or
.Li LINEMODE
is enabled, and the
.Ic suspend
character is typed, a
.Li TELNET SUSP
sequence (see
.Ic send
.Ic susp
above)
is sent to the remote host.
The initial value for the suspend character is taken to be
the terminal's
.Ic suspend
character.
.Tp Ic tracefile
This is the file to which the output, caused by
.Ic netdata,
.Ic termdata,
or
.Ic option
tracing being TRUE, will be written.  If it is set to
.Dq Fl ,
then tracing information will be written to standard output (the default).
.Tp Ic worderase
If
.Nm telnet
is operating in
.Li LINEMODE
or \*(Lqold line by line\*(Lq mode, then this character is taken to
be the terminal's
.Ic worderase
character.
The initial value for the worderase character is taken to be
the terminal's
.Ic worderase
character.
.Tp Ic \&?
Displays the legal
.Ic set
.Pq Ic unset
commands.
.Tp
.\" ######## END the "set" and "unset" commands
.\"
.\" ######## BEGIN the "slc" command
.Tp Cx Ic slc
.Cx \&\ \&
.Ar state
.Cx
The
.Ic slc
command (Set Local Characters) is used to set
or change the state of the the special
characters when the 
.Li TELNET LINEMODE
option has
been enabled.  Special characters are characters that get
mapped to 
.Li TELNET
commands sequences (like
.Ic ip
or
.Ic quit  )
or line editing characters (like
.Ic erase
and
.Ic kill  ) .
By default, the local special characters are exported.
.Tw Fl
.Tp Ic export
Switch to the local defaults for the special characters.  The
local default characters are those of the local terminal at
the time when
.Nm telnet
was started.
.Tp Ic import
Switch to the remote defaults for the special characters.
The remote default characters are those of the remote system
at the time when the 
.Li TELNET
connection was established.
.Tp Ic check
Verify the current settings for the current special characters.
The remote side is requested to send all the current special
character settings, and if there are any discrepancies with
the local side, the local side will switch to the remote value.
.Tp Ic \&?
Prints out help information for the
.Ic slc
command.
.Tp
.\" ######## END the "slc" command
.\"
.\" ######## BEGIN the "status" command
.Tp Ic status
Show the current status of
.Nm telnet  .
This includes the peer one is connected to, as well
as the current mode.
.\" ######## END the "status" command
.\"
.\" ######## BEGIN the "toggle" command
.Tp Cx Ic toggle
.Cx \&\ \&
.Ar arguments ...
.Cx
Toggle (between
TRUE
and
FALSE)
various flags that control how
.Nm telnet
responds to events.
These flags may be set explicitly to TRUE or FALSE
using the
.Ic set
and
.Ic unset
commands listed above.
More than one argument may be specified.
The state of these flags may be interrogated with the
.Ic display
command.
Valid arguments are:
.Tw Ar
.Tp Ic authdebug
Turn on debugging information for the authentication code.
.Tp Ic autoflush
If
.Ic autoflush
and
.Ic localchars
are both
TRUE,
then when the
.Ic ao  ,
or
.Ic quit
characters are recognized (and transformed into
.Li TELNET
sequences; see
.Ic set
above for details),
.Nm telnet
refuses to display any data on the user's terminal
until the remote system acknowledges (via a
.Li TELNET TIMING MARK
option)
that it has processed those
.Li TELNET
sequences.
The initial value for this toggle is TRUE if the terminal user had not
done an "stty noflsh", otherwise FALSE (see
.Xr stty  1  ) .
.Tp Ic autoencrypt
.Tp Ic autodecrypt
When the
.Li TELNET ENCRYPTION
option is negotiated,
by default the actual encryption (decryption) of the data
stream does not automatically start.
The
.Ic autoencrypt
.Ic (autodecrypt)
command states that encryption of the output (input) stream should be
enabled as soon as possible.
.Tp Ic autologin
If the
.Li TELNET AUTHENTICATION
option is supported by the remote side, then
.Nm telnet
will attempt to use it to perform automatic authentication.
If the
.Li AUTHENTICATION
option is not supported, then the users login name will
be propagated via the
.Li TELNET ENVIRON
option.
This command is the same as specifying
.Fl a
option on the
.Ic open
command.
.Tp Ic autosynch
If
.Ic autosynch
and
.Ic localchars
are both
TRUE,
then when either the
.Ic intr
or
.Ic quit
characters is typed (see
.Ic set
above for descriptions of the
.Ic intr
and
.Ic quit
characters), the resulting
.Li TELNET
sequence sent is followed by the
.Li TELNET SYNCH
sequence.
This procedure
.Ic should
cause the remote system to begin throwing away all previously
typed input until both of the
.Li TELNET
sequences have been read and acted upon.
The initial value of this toggle is FALSE.
.Tp Ic binary
Enable or disable the
.Li TELNET BINARY
option on both input and output.
.Tp Ic inbinary
Enable or disable the
.Li TELNET BINARY
option on input.
.Tp Ic outbinary
Enable or disable the
.Li TELNET BINARY
option on output.
.Tp Ic crlf
If this is TRUE, then carriage returns will be sent as <CR><LF>.
If this is FALSE, then carriage returns will be send as <CR><NUL>.
The initial value for this toggle is FALSE.
.Tp Ic 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.
.Tp Ic debug
Toggles socket level debugging (useful only to the
.Ic super user  ) .
The initial value for this toggle is FALSE.
.Tp Ic encdebug
Turn on debugging information for the encryption code.
.Tp Ic localchars
If this is
TRUE,
then the
.Ic flush  ,
.Ic interrupt ,
.Ic quit  ,
.Ic erase ,
and
.Ic kill
characters (see
.Ic set
above) are recognized locally, and transformed into (hopefully) appropriate
.Li TELNET
control sequences
(respectively
.Ic ao  ,
.Ic ip ,
.Ic brk  ,
.Ic ec ,
and
.Ic el  ;
see
.Ic send
above).
The initial value for this toggle is TRUE in \*(Lqold line by line\*(Rq mode,
and FALSE in \*(Lqcharacter at a time\*(Rq mode.
When the
.Li LINEMODE
option is enabled, the value of
.Ic localchars
is ignored, and assumed to always be TRUE.
If
.Li LINEMODE
has ever been enabled, then
.Ic quit
is sent as
.Ic abort  ,
and
.Ic eof and
.B suspend
are sent as
.Ic eof and
.Ic susp ,
see
.Ic send
above).
.Tp Ic netdata
Toggles the display of all network data (in hexadecimal format).
The initial value for this toggle is FALSE.
.Tp Ic options
Toggles the display of some internal
.Nm telnet
protocol processing (having to do with
.Li TELNET
options).
The initial value for this toggle is FALSE.
.Tp Ic prettydump
When the
.Ic netdata
or
.Ic termdata
toggle is enabled, if
.Ic prettydump
is enabled the output from the
.Ic netdata
and
.Ic termdata
command will be formated in a more user readable format.
Spaces are put between each character in the output, and the
beginning of any
.Li TELNET
escape sequence is preceded by a '*' to aid in locating them.
.Tp Ic skiprc
When the
.Ic skiprc
toggle
is TRUE, then
.Nm telnet
will skip the reading of the
.Pa \&.telnetrc
file in the users home directory
when connections are opened.
The initial value for this toggle is FALSE.
.Tp Ic termdata
Toggles the display of all terminal data (in hexadecimal format).
The initial value for this toggle is FALSE.
.Tp Ic verbose_encrypt
When the
.Ic verbose_encrypt
toggle is TRUE, then
.Nm telnet
will print out a message each time encryption is
enabled or disabled.
The initial value for this toggle is FALSE.
.Tp Ic \&?
Displays the legal
.Ic toggle
commands.
.Tp
.\" ######## END the "toggle" command
.\"
.\" ######## BEGIN the "z" command
.Tp Ic z
Suspend
.Nm telnet  .
This command only works when the user is using the
.Xr csh  1  .
.\" ######## END the "z" command
.\"
.\" ######## BEGIN the "!" command
.Tp Cx Ic \&!
.Cx \&\ \&
.Op Ar command
.Cx
Execute a single command in a subshell on the local
system.  If
.Ic command
is omitted, then an interactive
subshell is invoked.
.\" ######## END the "!" command
.\"
.\" ######## BEGIN the "?" command
.Tp Cx Ic \&?
.Cx \&\ \&
.Op Ar command
.Cx
Get help.  With no arguments,
.Nm telnet
prints a help summary.
If a command is specified,
.Nm telnet
will print the help information for just that command.
.\" ######## END the "!" command
.Sh ENVIRONMENT
.Nm Telnet
uses at least the
.Ev HOME ,
.Ev SHELL ,
.Ev DISPLAY ,
and
.Ev TERM
environment variables.
Other environment variables may be propagated
to the other side via the
.Li TELNET ENVIRON
option.
.Sh FILES
.Dw ~/.telnetrc
.Di L
.Dp Pa ~/.telnetrc
user customized telnet startup values
.Dp
.Sh HISTORY
.Nm Telnet
appeared in 4.2 BSD.
.Sh NOTES
.Pp
On some remote systems, echo has to be turned off manually when in
\*(Lqold line by line\*(Rq mode.
.Pp
In \*(Lqold line by line\*(Rq mode or 
.Li LINEMODE
the terminal's
.Ic eof
character is only recognized (and sent to the remote system)
when it is the first character on a line.