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```
watch [options] <command> # 周期性执行command，全屏输出，默认周期为2秒
#### 选项
-d, --differences permanent
-n, --interval seconds # 执行周期设为seconds秒
-x, --exec # 命令默认是通过"sh -c"来执行的，这意味着要给命令加引号才能正确执行。而使用此选项，命令将通过"exec"来执行。
#### 退出状态
0 # 成功执行
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