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shutdown
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===
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用来执行系统关机的命令
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## 补充说明
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**shutdown命令** 用来系统关机命令。shutdown指令可以关闭所有程序，并依用户的需要，进行重新开机或关机的动作。
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### 语法
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```
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shutdown(选项)(参数)
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```
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### 选项
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```
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-c：当执行“shutdown -h 11:50”指令时，只要按+键就可以中断关机的指令；
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-f：重新启动时不执行fsck；
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-F：重新启动时执行fsck；
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-h：将系统关机；
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-k：只是送出信息给所有用户，但不会实际关机；
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-n：不调用init程序进行关机，而由shutdown自己进行；
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-r：shutdown之后重新启动；
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-t<秒数>：送出警告信息和删除信息之间要延迟多少秒。
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```
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### 参数
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* [时间]：设置多久时间后执行shutdown指令；
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* [警告信息]：要传送给所有登入用户的信息。
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### 实例
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指定现在立即关机：
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```
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shutdown -h now
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```
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指定5分钟后关机，同时送出警告信息给登入用户：
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```
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shutdown +5 "System will shutdown after 5 minutes"
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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