Manual: 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
	   Print a short help text and exit.

       -H, --halt
	   Halt the machine.

       -P, --poweroff
	   Power the machine off (the default).

       -r, --reboot
	   Reboot the machine.

       -h
	   The same as --poweroff, but does not override the action to take if it is "halt". E.g.  shutdown --reboot -h
	   means "poweroff", but shutdown --halt -h means "halt".

       -k
	   Do not halt, power off, or reboot, but just write the wall message.

       --no-wall
	   Do not send wall message before halt, power off, or reboot.

       -c
	   Cancel a pending shutdown. This may be used to cancel the effect of an invocation of shutdown with a time
	   argument that is not "+0" or "now".

       --show
	   Show a pending shutdown action and time if there is any.

	   Added in version 250.

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

COMPATIBILITY
       The
	shutdown command in previous init systems (including sysvinit) defaulted to single-user mode instead of powering off
       the machine. To change into single-user mode, use systemctl rescue instead.

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

systemd 259.5													 SHUTDOWN(8)