> shutdown [OPTION…] [TIME] [WALL…]

Shut down the system.

Options:
     --help     Show this help
  -H --halt     Halt the machine
  -P --poweroff Power-off the machine
  -r --reboot   Reboot the machine
  -h            Equivalent to --poweroff, overridden by --halt
  -k            Don't halt/power-off/reboot, just send warnings
     --no-wall  Don't send wall message before halt/power-off/reboot
  -c            Cancel a pending shutdown
     --show     Show pending shutdown

This is a compatibility interface, please use the more powerful 'systemctl
halt', 'systemctl poweroff', 'systemctl reboot' commands instead.

See the shutdown(8) man page for details.