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) 0
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