telnet - user interface to the TELNET protocol
telnet [-8ELadr] [-S tos] [-e escapechar] [-l user] [-n tracefile] [host [port]]
The telnet command is used for interactive communication with another host using the TELNET protocol. It begins in command mode, where it prints a telnet prompt ("telnet> «). If telnet is invoked with a host argument, it performs an open command implicitly; see the description below.
Options:
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Protocol:
Once a connection has been opened, telnet will attempt to enable the TELNET LINEMODE option. If this fails, then telnet will revert to one of two input modes: either ``character at a time'' or ``old line by line'' depending on what the remote system supports.
When LINEMODE is enabled, character processing is done on the local system, under the control of the remote system. When input editing or character echoing 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 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).
If the LINEMODE option is enabled, or if the localchars toggle is TRUE (the default for ``old line by line``; see below), the user's quit, intr, and flush characters are trapped locally, and sent as TELNET protocol sequences to the remote side. If LINEMODE has ever been enabled, then the user's susp and eof are also sent as TELNET protocol sequences, and quit is sent as a TELNET ABORT instead of BREAK 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).
Commands:
The following telnet commands are available. Unique prefixes are understood as abbreviations.
auth argument ...
The auth command controls the TELNET AUTHENTICATE protocol option.
If telnet was compiled without authentication, the auth
command will not be supported. Valid arguments are as follows:
disable type Disable the specified type of authentication. To obtain a list of available types, use the auth disable ? command.
enable type Enable the specified type of authentication. To obtain a list of available types, use the auth enable ? command.
Note that the current version of telnet does not support authentication.
display argument ...
Display all, or some, of the set and toggle values (see be
low).
encrypt argument ...
The encrypt command controls the TELNET ENCRYPT protocol option.
If telnet was compiled without encryption, the encrypt
command will not be supported.
Valid arguments are as follows:
disable type [input|output]
Disable the specified type of encryption. If
you do not specify input or output, encryption
of both is disabled. To obtain a list of available
types, use ``encrypt disable ?''.
enable type [input|output]
Enable the specified type of encryption. If you
do not specify input or output, encryption of
both is enabled. To obtain a list of available
types, use ``encrypt enable ?''.
start [input|output]
Attempt to begin encrypting. If you do not
specify input or output, encryption of both input
and output is started.
stop [input|output]
Stop encrypting. If you do not specify input or
output, encryption of both is stopped.
Note that the current version of telnet does not support encryption.
environ arguments...
The environ command is used to propagate environment variables
across the telnet link using the TELNET ENVIRON protocol option.
All variables exported from the shell are defined, but
only the DISPLAY and PRINTER variables are marked to be sent
by default. The USER variable is marked to be sent if the -a
or -l command-line options were used.
Valid arguments for the environ command are:
define variable value
Define the variable variable to have a value of
value. Any variables defined by this command are
automatically marked for propagation (``exported'').
The value may be enclosed in single or
double quotes so that tabs and spaces may be in
cluded.
undefine variable
Remove any existing definition of variable.
export variable
Mark the specified variable for propagation to the
remote host.
unexport variable
Do not mark the specified variable for propagation
to the remote host. The remote host may still ask
explicitly for variables that are not exported.
mode type Type is one of several options, depending on the state of the session. Telnet asks the remote host to go into the requested mode. If the remote host says it can, that mode takes effect.
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.
open host [[-l] user][-port]
Open a connection to the named host. If no port number is
specified, telnet will attempt to contact a telnet daemon at
the standard port (23). The host specification may be a host
name or IP address. The -l option may be used to specify a
user name to be passed to the remote system, like the -l command-line
option.
When connecting to ports other than the telnet port, telnet does not attempt telnet protocol negotiations. This makes it possible to connect to services that do not support the telnet protocol without making a mess. Protocol negotiation can be forced by placing a dash before the port number.
After establishing a connection, any commands associated with the remote host in the user's .telnetrc file are executed.
The format of the .telnetrc file is as follows: Lines beginning with a #, and blank lines, are ignored. The rest of the file should consist of hostnames and sequences of telnet commands to use with that host. Commands should be one per line, indented by whitespace; lines beginning without whitespace are interpreted as hostnames. Upon connecting to a particular host, the commands associated with that host are executed.
send arguments
Send one or more special telnet protocol character sequences
to the remote host. The following are the codes which may be
specified (more than one may be used in one command):
escape Sends the current telnet escape character.
getstatus
If the remote side supports the TELNET STATUS command,
getstatus will send the subnegotiation to request that
the server send its current option status.
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 4.2BSD system -- if it doesn't work, a lower case ``r'' may be echoed on the terminal).
do cmd
dont cmd
will cmd
wont cmd
Sends the TELNET DO cmd sequence. cmd can be either a
decimal number between 0 and 255, or a symbolic name
for a specific TELNET command. cmd can also be either
help or ? to print out help information, including a
list of known symbolic names.
set argument value
unset argument value
The set command will set any one of a number of telnet variables
to a specific value or to TRUE. The special value off
turns off the function associated with the variable. This is
equivalent to using the unset command. The unset command will
disable or set to FALSE any of the specified variables. The
values of variables may be interrogated with the display command.
The variables which may be set or unset, but not toggled,
are listed here. In addition, any of the variables for
the toggle command may be explicitly set or unset.
escape This is the telnet escape character (initially ``^['') which causes entry into telnet command mode (when connected to a remote system).
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.
forw1
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.
reprint
If telnet is operating in LINEMODE or ``old line by
line`` mode, then this character is taken to be the
terminal's reprint character. The initial value for
the reprint character is taken to be the terminal's
reprint character.
rlogin This is the rlogin mode escape character. Setting it enables rlogin mode, as with the r command-line option (q.v.)
tracefile
This is the file to which the output, caused by
netdata or option tracing being TRUE, will be written.
If it 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.
slc state The slc command (Set Local Characters) is used to set or change the state of the the 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 characters (like erase and kill). By default, the local special characters are exported.
toggle arguments ...
Toggle (between TRUE and FALSE) various flags that control how
telnet responds to events. These flags may be set explicitly
to TRUE or FALSE using the set and unset commands. More than
one flag may be toggled at once. The state of these flags may
be examined with the display command. Valid flags are:
Note that this flag exists only if encryption support is enabled.
verbose_encrypt
When the verbose_encrypt toggle is TRUE, TELNET
prints out a message each time encryption is enabled
or disabled. The initial value for this
toggle is FALSE. This flag only exists if encryption
support is available.
! [command]
Execute a single command in a subshell on the local system.
If command is omitted, then an interactive subshell is in
voked.
? [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.
Telnet uses at least the HOME, SHELL, DISPLAY, and TERM environment variables. Other environment variables may be propagated to the other side via the TELNET ENVIRON option.
~/.telnetrc user customized telnet startup values
The Telnet command appeared in 4.2BSD.
On some remote systems, echo has to be turned off manually when in ``old 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 source code is not comprehensible.