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

-H, --halt

-P, --poweroff

-r, --reboot

-h

-k

--no-wall

-c

EXIT STATUS¶

On success, 0 is returned, a non-zero failure code otherwise.

SEE ALSO¶

systemd(1), systemctl(1), halt(8), wall(1)