protocol The command is used to communicate with another host using the
protocol. If is invoked without the argument, it enters command mode,
indicated by its prompt In this mode, it accepts and executes the commands
listed below. If it is invoked with arguments, it performs an command with
those arguments. Options: Specifies an 8-bit data path. This causes an
attempt to negotiate the option on both input and output. Stops any
character from being recognized as an escape character. If Kerberos V5
authentication is being used, the option allows the local credentials to be
forwarded to the remote system, including any credentials that have already
been forwarded into the local environment. Specifies no automatic login to
the remote system. Specifies an 8-bit data path on output. This causes
the BINARY option to be negotiated on output. Sets the IP type-of-service
(TOS) option for the telnet connection to the value which can be a numeric
TOS value or, on systems that support it, a symbolic TOS name found in the
/etc/iptos file. Disables the type of authentication. Attempt automatic
login. Currently, this sends the user name via the variable of the option
if supported by the remote system. The name used is that of the current
user as returned by if it agrees with the current user ID, otherwise it is
the name associated with the user ID. Disables the reading of the user's
file. (See the command on this man page.) Sets the initial value of the
toggle to Sets the initial escape character to If is omitted, then there
will be no escape character. If Kerberos V5 authentication is being used,
the option allows the local credentials to be forwarded to the remote
system. If Kerberos authentication is being used, the option requests that
telnet obtain tickets for the remote host in realm realm instead of the
remote host's realm, as determined by When connecting to the remote system,
if the remote system understands the option, then will be sent to the
remote system as the value for the variable USER. This option implies the
option. This option may also be used with the command. Opens for
recording trace information. See the command below. Specifies a user
interface similar to In this mode, the escape character is set to the tilde
(~) character, unless modified by the -e option. Turns on encryption of
the data stream if possible. This option is not available outside of the
United States and Canada. Indicates the official name, an alias, or the
Internet address of a remote host. Indicates a port number (address of an
application). If a number is not specified, the default port is used.
When in rlogin mode, a line of the form ~. disconnects from the remote
host; ~ is the telnet escape character. Similarly, the line ~^Z suspends
the telnet session. The line ~^] escapes to the normal telnet escape
prompt. Once a connection has been opened, will attempt to enable the
option. If this fails, then 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 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 option is enabled, or
if the toggle is (the default for old line by line; see below), the user's
and characters are trapped locally, and sent as protocol sequences to the
remote side. If has ever been enabled, then the user's and are also sent
as protocol sequences, and is sent as a instead of There are options (see
and below) which cause this action to flush subsequent output to the
terminal (until the remote host acknowledges the sequence) and flush
previous terminal input (in the case of and While connected to a remote
host, command mode may be entered by typing the escape character (initially
^]). When in command mode, the normal terminal editing conventions are
available. 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 and commands). The auth command manipulates the
information sent through the option. Valid arguments for the auth command
are as follows: Disables the specified type of authentication. To obtain a
list of available types, use the command. Enables the specified type of
authentication. To obtain a list of available types, use the command.
Lists the current status of the various types of authentication. Close a
session and return to command mode. Displays all, or some, of the and
values (see below). The encrypt command manipulates the information sent
through the option. Note: Because of export controls, the option is not
supported outside of the United States and Canada. Valid arguments for the
encrypt command are as follows: 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 command. 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 command. This
is the same as the command. This is the same as the command. This is the
same as the command. This is the same as the command. Attempts to start
encryption. If you omit and both input and output are enabled. To obtain
a list of available types, use the command. Lists the current status of
encryption. Stops encryption. If you omit input and output, encryption is
on both input and output. Sets the default type of encryption to be used
with later or commands. The command is used to manipulate the the
variables that my be sent through the option. The initial set of variables
is taken from the users environment, with only the and variables being
exported by default. The variable is also exported if the or options are
used.
Valid arguments for the command are: Define the variable to have a value of
Any variables defined by this command are automatically exported. The may
be enclosed in single or double quotes so that tabs and spaces may be
included. Remove from the list of environment variables. Mark the
variable to be exported to the remote side. Mark the variable to not be
exported unless explicitly asked for by the remote side. List the current
set of environment variables. Those marked with a will be sent
automatically, other variables will only be sent if explicitly requested.
Prints out help information for the command. Sends the option to the
remote side. This command is similar to a command; however, if the remote
side does not support the option, nothing happens. If, however, the remote
side does support the option, this command should cause the remote side to
close the connection. If the remote side also supports the concept of
suspending a user's session for later reattachment, the logout argument
indicates that you should terminate the session immediately. is one of
several options, depending on the state of the session. 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. Disable
the option, or, if the remote side does not understand the option, then
enter character at a time mode. Enable the option, or, if the remote side
does not understand the option, then attempt to enter old-line-by-line
mode. Attempt to enable (disable) the mode of the option. This requires
that the option be enabled. Attempt to enable (disable) the mode of the
option. This requires that the option be enabled. Attempt to enable
(disable) the mode of the option. This requires that the option be
enabled. Attempt to enable (disable) the mode of the option. This
requires that the option be enabled. Prints out help information for the
command. Open a connection to the named host. If no port number is
specified, will attempt to contact a server at the default port. The host
specification may be either a host name (see or an Internet address
specified in the dot notation (see The option may be used to specify the
user name to be passed to the remote system via the option. When
connecting to a non-standard port, omits any automatic initiation of
options. When the port number is preceded by a minus sign, the initial
option negotiation is done. After establishing a connection, the file in
the users home directory is opened. Lines beginning with a # are comment
lines. Blank lines are ignored. Lines that begin without white space are
the start of a machine entry. The first thing on the line is the name of
the machine that is being connected to. The rest of the line, and
successive lines that begin with white space are assumed to be commands and
are processed as if they had been typed in manually to the command prompt.
Close any open session and exit An end of file (in command mode) will also
close a session and exit. 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): Sends the (Abort
processes) sequence. Sends the (Abort Output) sequence, which should cause
the remote system to flush all output the remote system the user's
terminal. Sends the (Are You There) sequence, to which the remote system
may or may not choose to respond. Sends the (Break) sequence, which may
have significance to the remote system. Sends the (Erase Character)
sequence, which should cause the remote system to erase the last character
entered. Sends the (Erase Line) sequence, which should cause the remote
system to erase the line currently being entered. Sends the (End Of File)
sequence. Sends the (End of Record) sequence. Sends the current escape
character (initially ^). Sends the (Go Ahead) sequence, which likely has
no significance to the remote system. If the remote side supports the
command, will send the subnegotiation to request that the server send its
current option status. Sends the (Interrupt Process) sequence, which
should cause the remote system to abort the currently running process.
Sends the (No OPeration) sequence. Sends the (SUSPend process) sequence.
Sends the sequence. This sequence causes the remote system to discard all
previously typed (but not yet read) input. This sequence is sent as urgent
data (and may not work if the remote system is a system -- if it doesn't
work, a lower case r may be echoed on the terminal). Sends the sequence.
can be either a decimal number between 0 and 255, or a symbolic name for a
specific command. can also be either or to print out help information,
including a list of known symbolic names. Prints out help information for
the command. The command will set any one of a number of variables to a
specific value or to The special value turns off the function associated
with the variable, this is equivalent to using the command. The command
will disable or set to any of the specified functions. The values of
variables may be interrogated with the command. The variables which may be
set or unset, but not toggled, are listed here. In addition, any of the
variables for the command may be explicitly set or unset using the and
commands. If is in localchars mode, or is enabled, and the status
character is typed, a sequence (see preceding) is sent to the remote host.
The initial value for the "Are You There" character is the terminal's
status character. 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). If is operating in or old 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 character. If is in mode (see
below), if is operating in character at a time mode, then when this
character is typed, a sequence (see above) is sent to the remote system.
The initial value for the erase character is taken to be the terminal's
character. This is the escape character (initially ^[) which causes entry
into command mode (when connected to a remote system). If is in mode (see
below) and the character is typed, a sequence (see above) is sent to the
remote host. The initial value for the flush character is taken to be the
terminal's character. If is operating in these are the characters that,
when typed, cause partial lines to be forwarded to the remote system. The
initial value for the forwarding characters are taken from the terminal's
eol and eol2 characters. If is in mode (see below) and the character is
typed, a sequence (see above) is sent to the remote host. The initial
value for the interrupt character is taken to be the terminal's character.
If is in mode (see below), if is operating in character at a time mode,
then when this character is typed, a sequence (see above) is sent to the
remote system. The initial value for the kill character is taken to be the
terminal's character. If is operating in or old line by line mode, then
this character is taken to be the terminal's character. The initial value
for the lnext character is taken to be the terminal's character. If is in
mode (see below) and the character is typed, a sequence (see above) is sent
to the remote host. The initial value for the quit character is taken to
be the terminal's character. If is operating in or old line by line mode,
then this character is taken to be the terminal's character. The initial
value for the reprint character is taken to be the terminal's character.
This is the rlogin escape character. If set, the normal escape character
is 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 "." closes
the connection; when followed by a ^Z it suspends the telnet command. The
initial state is to disable the rlogin escape character. If the option has
been enabled, then this character is taken to be the terminal's character.
The initial value for the kill character is taken to be the terminal's
character. If the option has been enabled, then this character is taken to
be the terminal's character. The initial value for the kill character is
taken to be the terminal's character. If is in mode, or is enabled, and
the character is typed, a sequence (see above) is sent to the remote host.
The initial value for the suspend character is taken to be the terminal's
character. This is the file to which the output, caused by or tracing
being will be written. If it is set to then tracing information will be
written to standard output (the default). If is operating in or old line
by line mode, then this character is taken to be the terminal's character.
The initial value for the worderase character is taken to be the terminal's
character. Displays the legal commands. The command (Set Local
Characters) is used to set or change the state of the the special
characters when the option has been enabled. Special characters are
characters that get mapped to commands sequences (like or or line editing
characters (like and By default, the local special characters are exported.
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. Switch to the local defaults for the special
characters. The local default characters are those of the local terminal
at the time when was started. Switch to the remote defaults for the
special characters. The remote default characters are those of the remote
system at the time when the connection was established. Prints out help
information for the command. Show the current status of This includes the
peer one is connected to, as well as the current mode. Toggle (between and
various flags that control how responds to events. These flags may be set
explicitly to or using the and commands listed above. More than one
argument may be specified. The state of these flags may be interrogated
with the command. Valid arguments are: Turns on debugging information for
the authentication code. If and are both then when the or characters are
recognized (and transformed into sequences; see above for details), refuses
to display any data on the user's terminal until the remote system
acknowledges (via a option) that it has processed those sequences. The
initial value for this toggle is if the terminal user had not done an "stty
noflsh", otherwise (see When the option is negotiated, by default the
actual encryption (decryption) of the data stream does not start
automatically. The autoencrypt (autodecrypt) command states that
encryption of the output (input) stream should be enabled as soon as
possible.
Note: Because of export controls, the option is not supported outside the
United States and Canada. If the remote side supports the option attempts
to use it to perform automatic authentication. If the option is not
supported, the user's login name are propagated through the option. This
command is the same as specifying option on the command. If and are both
then when either the or characters is typed (see above for descriptions of
the and characters), the resulting sequence sent is followed by the
sequence. This procedure cause the remote system to begin throwing away
all previously typed input until both of the sequences have been read and
acted upon. The initial value of this toggle is Enable or disable the
option on both input and output. Enable or disable the option on input.
Enable or disable the option on output. If this is then carriage returns
will be sent as If this is then carriage returns will be send as The
initial value for this toggle is 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 Toggles socket level debugging (useful only to the
The initial value for this toggle is Turns on debugging information for the
encryption code. If this is then the and characters (see above) are
recognized locally, and transformed into (hopefully) appropriate control
sequences (respectively and see above). The initial value for this toggle
is in old line by line mode, and in character at a time mode. When the
option is enabled, the value of is ignored, and assumed to always be If has
ever been enabled, then is sent as and suspend are sent as see above).
Toggles the display of all network data (in hexadecimal format). The
initial value for this toggle is Toggles the display of some internal
protocol processing (having to do with options). The initial value for
this toggle is When the toggle is enabled, if is enabled the output from
the command will be formatted in a more user readable format. Spaces are
put between each character in the output, and the beginning of any escape
sequence is preceded by a '*' to aid in locating them. When the skiprc
toggle is skips the reading of the file in the users home directory when
connections are opened. The initial value for this toggle is Toggles the
display of all terminal data (in hexadecimal format). The initial value
for this toggle is When the toggle is prints out a message each time
encryption is enabled or disabled. The initial value for this toggle is
Note: Because of export controls, data encryption is not supported outside
of the United States and Canada. Displays the legal commands. Suspend
This command only works when the user is using the Execute a single command
in a subshell on the local system. If is omitted, then an interactive
subshell is invoked. Get help. With no arguments, prints a help summary.
If a command is specified, will print the help information for just that
command. uses at least the and environment variables. Other environment
variables may be propagated to the other side via the option. user
customized telnet startup values The command appeared in 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 the terminal's character is only recognized
(and sent to the remote system) when it is the first character on a line.
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