telnet Top Level
telnet
- Quick and Concise Document
- Beginners
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Command Description
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telnet Enter telnet command mode.
telnet host.name Communicate with host.name
The telnet command is used to communicate with another host using the
TELNET protocol. If telnet is invoked without the host argument, it
enters command mode, indicated by its prompt (telnet>). See "Advanced
Help" for a list of commands you can use with telnet while in command
mode.
telnet is a very simple program to use. To telnet to a particular site,
type:
world% telnet host.name
For Example:
world% telnet csa.bu.edu
or (for someone outside of this system)
% telnet world.std.com
You can only use telnet to log in to another machine on the Internet
if you have an account there, or if they are running a special service
that lets you log in as, say, "gopher".
The telnet command is used to communicate with another host using the
TELNET protocol. If telnet is invoked without the host argument, 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.
Options:
-d Sets the initial value of the debug toggle to TRUE.
-n tracefile
Opens tracefile for recording trace information. See the set
tracefile command below.
-l user When connecting to the remote system, if the remote system
understands the ENVIRON option, then user will be sent to the
remote system as the value for the variable USER. This option
may also be used with the open command.
-a Auto-login. Same as specifying -l with your user name. This
option may also be used with the open command.
-e escape-char
Sets the initial telnet escape character to escape-char. If
escape-char is the null character (specified by "" or ''), then
there will be no escape character.
host Indicates the official name, an alias, or the Internet address of
a remote host.
port Indicates a port number (address of an application). If a number
is not specified, the default telnet port is used.
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.
The following telnet 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, unset, slc, environ, and display commands).
close
Close a TELNET session and return to command mode.
display [ argument... ]
Displays all, or some, of the set and toggle values (see
below).
mode type
Type is one of several options, depending on the state of the
TELNET 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.
character
Disable the TELNET LINEMODE option, or, if the remote side
does not understand the LINEMODE option, then enter
"character at a time" mode.
line
Enable the TELNET LINEMODE option, or, if the remote side
does not understand the LINEMODE option, then attempt to
enter "old-line-by-line" mode.
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.
?
Prints out help information for the mode command.
open host [ [-l user | -a] [-]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(4)) or an Internet address specified in the
"dot notation" (see inet(3N)). The -l option may be used to
specify the user name to be passed to the remote system via the
ENVIRON option. The -a option sends your user name to the
remote system via the ENVIRON option. When connecting to a
non-standard port, telnet omits any automatic initiation of
TELNET options. When the port number is preceded by a minus
sign, the initial option negotiation is done. After
establishing a connection, the .telnetrc in the user's home
directory is opened. Lines beginning with a # are comment
lines. Blank lines are ignored. Lines that begin without
whitespace 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
whitespace are assumed to be telnet commands and are processed
as if they had been typed in manually to the telnet command
prompt.
quit
Close any open TELNET session and exit telnet. An end of file
(in command mode) will also close a session and exit.
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