[linux命令]Linux shutdown 关机命令

wangyetao@linux_u1604:~$ shutdown --help
shutdown [OPTIONS...] [TIME] [WALL...]

Shut down the system.

     --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
wangyetao@linux_u1604:~$ 

wangyetao@linux_u1604:~$ shutdown -h 20:30
Shutdown scheduled for 二 2018-03-27 20:30:00 CST, use 'shutdown -c' to cancel.
wangyetao@linux_u1604:~$