NAME¶shutdown - Halt, power-off or reboot the machine
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)