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