Provided by: systemd-sysv_252.5-2ubuntu3_amd64 bug


       halt, poweroff, reboot - Halt, power-off or reboot the machine


       halt [OPTIONS...]

       poweroff [OPTIONS...]

       reboot [OPTIONS...]


       halt, poweroff, reboot may be used to halt, power-off, or reboot the machine. All three
       commands take the same options.


       The following options are understood:

           Print a short help text and exit.

           Halt the machine, regardless of which one of the three commands is invoked.

       -p, --poweroff
           Power-off the machine, when either halt or poweroff is invoked. This option is ignored
           when reboot is invoked.

           Reboot the machine, regardless of which one of the three commands is invoked.

       -f, --force
           Force immediate halt, power-off, 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.

       -w, --wtmp-only
           Only write wtmp shutdown entry, do not actually halt, power-off, reboot.

       -d, --no-wtmp
           Do not write wtmp shutdown entry.

       -n, --no-sync
           Don't sync hard disks/storage media before halt, power-off, reboot.

           Do not send wall message before halt, power-off, reboot.


       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 halt, poweroff, reboot 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)