07-23-2006
man write
man talk
man wall
========
Write does just that. Writes what you type (ending the message with a "Ctrl-D") to the terminal of the user you want to send a message to. It is one-way.
Talk will try to connect to a users terminal to start a two-way conversation. It uses the curses library to control the screens (terminals) used in the connection.
wall is "write to all" one way communication to all logged in users. It is how the "shutdown message" is sent when root uses shutdown (1m) to change the run level of a system.
The "man" pages (UNIX Manual) contain about 80% of the information needed to understand how to use the basic commands that come with the system.
Last edited by reborg; 07-23-2006 at 07:51 AM..
Reason: Rules 1&2
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LEARN ABOUT CENTOS
shutdown
SHUTDOWN(8) shutdown SHUTDOWN(8)
NAME
shutdown - Halt, power-off or reboot the machine
SYNOPSIS
shutdown [OPTIONS...] [TIME] [WALL...]
DESCRIPTION
shutdown may be used to halt, power-off or reboot the machine.
The first argument may be a time string (which is usually "now"). Optionally, this may be followed by a wall message to be sent to all
logged-in users before going down.
The time string may either be in the format "hh:mm" for hour/minutes specifying the time to execute the shutdown at, specified in 24h clock
format. Alternatively it may be in the syntax "+m" referring to the specified number of minutes m from now. "now" is an alias for "+0",
i.e. for triggering an immediate shutdown. If no time argument is specified, "+1" is implied.
Note that to specify a wall message you must specify a time argument, too.
If the time argument is used, 5 minutes before the system goes down the /run/nologin file is created to ensure that further logins shall
not be allowed.
OPTIONS
The following options are understood:
--help
Prints a short help text and exits.
-H, --halt
Halt the machine.
-P, --poweroff
Power-off the machine (the default).
-r, --reboot
Reboot the machine.
-h
Equivalent to --poweroff, unless --halt is specified.
-k
Do not halt, power-off, reboot, just write wall message.
--no-wall
Do not send wall message before halt, power-off, reboot.
-c
Cancel a pending shutdown. This may be used cancel the effect of an invocation of shutdown with a time argument that is not "+0" or
"now".
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
SEE ALSO
systemd(1), systemctl(1), halt(8), wall(1)
systemd 208 SHUTDOWN(8)