shutdown(category14-security-amp-firewalls.html) - phpMan

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-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 239                                                        SHUTDOWN(8)