SHUTDOWN(8)shutdownSHUTDOWN(8)NAMEshutdown - Halt, power-off or reboot the machine
SYNOPSISshutdown [OPTIONS...] [TIME] [WALL...]
DESCRIPTIONshutdown 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
/etc/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
Don't halt, power-off, reboot, just write wall message.
--no-wall
Don't 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.
NOTES
This is a legacy command available for compatibility only.
SEE ALSOsystemd(1), systemctl(1), halt(8), wall(1)AUTHOR
Lennart Poettering <lennart@poettering.net>
Developer
systemd 03/16/2012 SHUTDOWN(8)