18. juli 2001 - 19:49
#13
Ved ikke om det er det rigtige men jeg poster det. Det er meget langt ;)
The telnet command is used to communicate with another host using the TELNET protocol. If telnet is invoked without arguments, 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.
Once a connection has been opened, telnet enters an input mode. The input mode entered is either character at a time or line by line, depending on what the remote system supports.
In character at a time mode, most text typed is immediately sent to the remote host for processing.
In 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 the local echo off and on (this would mostly be used to enter passwords without the password being echoed).
In either mode, if the localchars toggle is TRUE (the default in line mode; see below), the user\'s quit, intr, and flush characters are trapped locally and sent as TELNET protocol sequences to the remote side. 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).
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.
Commands
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 mode, set, toggle, and display commands).
open host [port]
Open a connection to the named host. If no port number is specified, telnet attempts to contact a TELNET server at the default port. The host specification may be either a host name (see hosts (5)) or an Internet address specified in the dot notation (see inet (3N)).
close
Close a TELNET session and return to command mode.
quit
Close any open TELNET session and exit telnet. An end of file (in command mode) also closes a session and exits.
z
Suspend telnet. This command enters a sub-shell. The user may return to telnet by exiting the subshell.
mode type
Type is either line (for line-by-line mode) or character (for character-at-a-time mode). 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 is entered.
status
Show the current status of telnet. This includes the peer one is connected to, as well as the current mode.
display [ argument... ]
Displays all, or some, of the set and toggle values (see below).
? [ command ]
Get help. With no arguments, telnet prints a help summary. If a command is specified, telnet prints the help information for just that command.
send arguments
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):
escape
Sends the current telnet escape character (initially ^]).
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 4.2 BSD system - if it doesn\'t work, a lowercase r may be echoed on the terminal).
brk
Sends the TELNET BRK (Break) sequence, which may have significance to the remote system.
ip
Sends the TELNET IP (Interrupt Process) sequence, which should cause the remote system to abort the currently running process.
ao
Sends the TELNET AO (Abort Output) sequence, which should cause the remote system to flush all output from the remote system to the user\'s terminal.
ayt
Sends the TELNET AYT (Are You There) sequence, to which the remote system may choose to respond.
ec
Sends the TELNET EC (Erase Character) sequence, which should cause the remote system to erase the last character entered.
el
Sends the TELNET EL (Erase Line) sequence, which should cause the remote system to erase the line currently being entered.
ga
Sends the TELNET GA (Go Ahead) sequence, which likely has no significance to the remote system.
nop
Sends the TELNET NOP (No OPeration) sequence.
?
Prints out help information for the send command.
set argument value
Set any one of a number of telnet variables to a specific value. The special value off turns off the function associated with the variable. The values of variables may be interrogated with the display command. The variables which may be specified are:
echo
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).
escape
This is the telnet escape character (initially ^[) which causes entry into telnet command mode (when connected to a remote system).
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.
quit
If telnet is in localchars mode (see toggle localchars below) and the quit character is typed, a TELNET BRK sequence (see send brk above) is sent to the remote host. The initial value for the quit character is taken to be the terminal\'s quit character.
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.
erase
If telnet is in localchars mode (see toggle localchars below), and if telnet is operating in character-at-a-time mode, then when this character is typed, a TELNET EC sequence (see send ec above) is sent to the remote system. The initial value for the erase character is taken to be the terminal\'s erase character.
kill
If telnet is in localchars mode (see toggle localchars below), and if telnet is operating in character-at-a-time mode, then when this character is typed, a TELNET EL sequence (see send el above) is sent to the remote system. The initial value for the kill character is taken to be the terminal\'s kill character.
eof
If telnet is operating in line-by-line mode, entering this character as the first character on a line causes this character to be sent to the remote system. The initial value of the eof character is taken to be the terminal\'s eof character.
toggle arguments...
Toggle (between TRUE and FALSE) various flags that control how telnet responds to events. More than one argument may be specified. The state of these flags may be interrogated with the display command. Valid arguments are:
localchars
If this is TRUE, then the flush, interrupt, quit, erase, and kill characters (see set above) are recognized locally, and transformed into (hopefully) appropriate TELNET control sequences (respectively ao, ip, brk, ec, and el; see send above). The initial value for this toggle is TRUE in line-by-line mode, and FALSE in character-at-a-time mode.
autoflush
If autoflush and localchars are both TRUE, then when the ao, intr, or quit characters are recognized (and transformed into TELNET sequences; see set above for details), telnet refuses to display any data on the user\'s terminal until the remote system acknowledges (via a TELNET Timing Mark option) that it has processed those TELNET sequences. The initial value for this toggle is TRUE if the terminal user had not done an stty noflsh, otherwise FALSE (see stty(1)).
autosynch
If autosynch and localchars are both TRUE, then when either the intr or quit character is typed (see set above for descriptions of the intr and quit characters), the resulting TELNET sequence sent is followed by the TELNET SYNCH sequence. This procedure should cause the remote system to begin throwing away all previously typed input until both of the TELNET sequences have been read and acted upon. The initial value of this toggle is FALSE.
crmod
Toggle carriage return mode. When this mode is enabled, most carriage return characters received from the remote host is 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.
debug
Toggles socket level debugging (useful only to the superuser ). The initial value for this toggle is FALSE.
options
Toggles the display of some internal telnet protocol processing (having to do with TELNET options). The initial value for this toggle is FALSE.
netdata
Toggles the display of all network data (in hexadecimal format). The initial value for this toggle is FALSE.
?
Displays the legal toggle commands.
Ny bruger
Nybegynder
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