SYSTEMD-POWEROFF.SERVICE(8) systemd-poweroff.service systemd-poweroff.service systemd-halt.service systemd-reboot.service systemd-kexec.service systemd-shutdown - systemd-poweroff.service systemd-halt.service systemd-reboot.service systemd-kexec.service /usr/lib/systemd/systemd-shutdown /usr/lib/systemd/system-shutdown/ systemd-poweroff.service poweroff.target . systemd-halt.service halt.target systemd-reboot.service reboot.target systemd-kexec.service kexec.target . PID 1 /usr/lib/systemd/systemd-shutdown . ( ) . -- PID 1 . // /kexec systemd-shutdown /usr/lib/systemd/system-shutdown/. : "poweroff" "halt" "reboot" "kexec" . . ( 90 .) ( /run/ API ). /var/ ( ). systemd-poweroff.service ( ) . "systemctl poweroff". systemd-soft-reboot.service(8). . systemd(1) systemctl(1) systemd.special(7) reboot(2) systemd-suspend.service(8) systemd-soft-reboot.service(8) bootup(7) 3 . . : . systemd 260.2 SYSTEMD-POWEROFF.SERVICE(8)