命令语法:
/sbin/shutdown [-t sec] [-arkhncfFHP] time [warning-message]
命令参数:
参数
长参数
描叙
-a
Use /etc/shutdown.allow.
-c
中断关机:当执行"shutdown -h 12:00"指令时,只要按+键就可以中断关机的指令
-f
重新启动时不进行磁盘检测(fsck)
-F
重新启动时进行磁盘检测(fsck)
-h
关闭电源
-k
模拟关机(不是真的关机),只是向登录者发送警告信息出去!
-n
不调用init进程进行关机,而是强行关机
-r
关闭系统然后重新启动,类似于Windows平台restart
-t
延迟关机的时间
-w
仅做测试,并不真的将系统重新开机,只会把重开机的数据写入/var/log目录下的wtmp记录文件
--help
显示命令在线帮助
使用示例:
1: 查看reboot命令的帮助信息
[root@db-server ~]# shutdown --help
shutdown: invalid option -- -
Usage: shutdown [-akrhHPfnc] [-t secs] time [warning message]
-a: use /etc/shutdown.allow
-k: don't really shutdown, only warn.
-r: reboot after shutdown.
-h: halt after shutdown.
-P: halt action is to turn off power.
-H: halt action is to just halt.
-f: do a 'fast' reboot (skip fsck).
-F: Force fsck on reboot.
-n: do not go through "init" but go down real fast.
-c: cancel a running shutdown.
-t secs: delay between warning and kill signal.
** the "time" argument is mandatory! (try "now") **
[root@db-server ~]#
2:马上关闭Linux系统,其中 now 相当于时间为 0 的状态
[root@db-server ~]# shutdown -h now
Broadcast message from root (pts/1) (Sat Jan 10 18:51:34 2015):
The system is going down for system halt NOW!
3:系统2分钟后重新启动,其中+m表示几分钟后关机或开机。
[root@db-server ~]# shutdown -r +2
Broadcast message from root (pts/2) (Sat Jan 10 19:56:00 2015):