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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | NOTES | SEE ALSO | COLOPHON |
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POWEROFF(8) poweroff POWEROFF(8)
poweroff, reboot, halt - Power off, reboot, or halt the machine
poweroff [OPTIONS...]
reboot [OPTIONS...]
halt [OPTIONS...]
poweroff, reboot, and halt may be used to power off, reboot, or
halt the machine. All three commands take the same options.
The following options are understood:
--help
Print a short help text and exit.
Added in version 253.
--halt
Halt the machine, regardless of which one of the three
commands is invoked.
Added in version 253.
-p, --poweroff
Power off the machine, when either halt or poweroff is
invoked. This option is ignored when reboot is invoked.
Added in version 253.
--reboot
Reboot the machine, regardless of which one of the three
commands is invoked.
Added in version 253.
-f, --force
Force immediate power-off, halt, or reboot. If specified, the
command does not contact the init system. In most cases,
filesystems are not properly unmounted before shutdown. For
example, the command reboot -f is mostly equivalent to
systemctl reboot -ff, instead of systemctl reboot -f.
Added in version 253.
-w, --wtmp-only
Only write wtmp shutdown entry, do not actually power off,
reboot, or halt.
Added in version 253.
-d, --no-wtmp
Do not write wtmp shutdown entry.
Added in version 253.
-n, --no-sync
Do not sync hard disks/storage media before power-off, reboot,
or halt.
Added in version 253.
--no-wall
Do not send wall message before power-off, reboot, or halt.
Added in version 253.
On success, 0 is returned, a non-zero failure code otherwise.
These commands are implemented in a way that preserves basic
compatibility with the original SysV commands. systemctl(1) verbs
poweroff, reboot, halt provide the same functionality with some
additional features.
Note that on many SysV systems halt used to be synonymous to
poweroff, i.e. both commands would equally result in powering the
machine off. systemd is more accurate here, and halt results in
halting the machine only (leaving power on), and poweroff is
required to actually power it off.
systemd(1), systemctl(1), shutdown(8), wall(1)
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
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-08-11.) If you discover 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 to
man-pages@man7.org
systemd 258~rc2 POWEROFF(8)
Pages that refer to this page: reboot(2), systemd.directives(7), systemd.index(7), fsck.minix(8), mkfs.minix(8), shutdown(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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