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,
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.
The following options are understood:
Print a short help text and exit.
Halt the machine.
Power-off the machine (the default).
Reboot the machine.
Equivalent to --poweroff, unless --halt is specified.
Do not halt, power-off, reboot, just write wall message.
Do not send wall message before halt, power-off, reboot.
Cancel a pending shutdown. This may be used cancel the effect of
an invocation of shutdown with a time argument that is not "+0"
This page is part of the systemd (systemd system and service manager)
project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2016-08-07. If you dis‐
cover any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page, or
you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a mail
systemd 231 SHUTDOWN(8)