关机

shutdown ：    

        -r +num：num分之后重启（不加“+num”,默认1分钟）

                shutdown -r now/hh:mm

shutdown -h +10 "System will be halt,please ready"：提醒其他人

        -c：取消关机

[root@localhost ~]# shutdown -r +10

Shutdown scheduled for Thu 2018-05-17 17:08:57 CST, use 'shutdown -c' to cancel.

[root@localhost ~]#

Broadcast message from [email protected] (Thu 2018-05-17 16:58:57 CST):

The system is going down for reboot at Thu 2018-05-17 17:08:57 CST!

[root@localhost ~]# shutdown -c

Broadcast message from [email protected] (Thu 2018-05-17 16:59:05 CST):

The system shutdown has been cancelled at Thu 2018-05-17 17:00:05 CST!