--help

Print a short help text and exit.

--no-wall

Do not send wall message before reboot/halt/power-off.The following commands are understood:0Power-off the machine. This is translated into an activation request for poweroff.target and is equivalentto systemctl poweroff.6Reboot the machine. This is translated into an activation request for reboot.target and is equivalent tosystemctl reboot.2, 3, 4, 5Change the SysV runlevel. This is translated into an activation request for runlevel2.target,runlevel3.target, ... and is equivalent to systemctl isolate runlevel2.target, systemctl isolaterunlevel3.target, ...1, s, SChange into system rescue mode. This is translated into an activation request for rescue.target and isequivalent to systemctl rescue.q, QReload daemon configuration. This is equivalent to systemctl daemon-reload.u, USerialize state, reexecute daemon and deserialize state again. This is equivalent to systemctldaemon-reexec.EXIT STATUSOn success, 0 is returned, a non-zero failure code otherwise.NOTESThis is a legacy command available for compatibility only. It should not be used anymore, as the concept ofrunlevels is obsolete.