SHUTDOWN(8)                       shutdown                       SHUTDOWN(8)NAME       shutdown - Halt, power-off or reboot the machineSYNOPSIS       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 Manual page shutdown(8) line 1 (press h for help or q to quit)