systemd Developer Lennart Poettering lennart@poettering.net shutdown 8 shutdown Halt, power-off or reboot the machine shutdown OPTIONS now WALL shutdown may be used to halt, power-off or reboot the machine. The first argument should be the string now which however is ignored by this implementation. Optionally, this may be followed by a wall message to be sent to all logged-in users before going down. The following options are understood: --help Prints a short help text and exits. -H --halt Halt the machine. -P --poweroff Power-off the machine (the default). -r --reboot Reboot the machine. -h Equivalent to --poweroff, unless --halt is specified. --k Don't halt, power-off, reboot, just write wall message. --no-wall Don't send wall message before halt, power-off, reboot. On success 0 is returned, a non-zero failure code otherwise. This is a legacy command available for compatibility only. systemd1, systemctl1, halt8, wall1