SHUTDOWN - Online Linux Manual PageSection : 8
Updated :
Source : systemd 253
Note : shutdown

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 /run/nologin file is created to ensure that further logins shall not be allowed​.

OPTIONSThe 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​.

EXIT STATUSOn success, 0 is returned, a non−zero failure code otherwise​.

COMPATIBILITYThe 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 ALSOsystemd(1), systemctl(1), halt(8), wall(1)
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