ubuntu server shutdown

(1)立刻关机shutdown -h now
(2)立刻重启shutdown -r now   (快速重启可以用“ctrl+Alt+Delete”)
(3)一分钟后重启,并提示:shutdown -r +1 "系统将要重新启动!"
(4)定时关机,例如晚上八点半:shutdown -h 20:30

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