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# **id**
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## 说明
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**id命令** 可以显示真实有效的用户ID(UID)和组ID(GID)。UID 是对一个用户的单一身份标识。组ID（GID）则对应多个UID。id命令已经默认预装
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在大多数Linux系统中。要使用它，只需要在你的控制台输入id。不带选项输入id会显示如下。结果会使用活跃用户
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当我们想知道某个用户的UID和GID时id命令是非常有用的。一些程序可能需要UID/GID来运行。id使我们更加容易地找出用户的UID以GID而不必在
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`/etc/group`文件中搜寻。如往常一样，你可以在控制台输入`man id`进入id的手册页来获取更多的详情
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## 选项
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```markdown
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-a ignore, for compatibility with other versions
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-Z, --context print only the security context of the current user
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-g, --group 仅打印有效的组ID
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-G, --groups print all group IDs
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-n, --name print a name instead of a number, for -ugG
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-r, --real print the real ID instead of the effective ID, with -ugG
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-u, --user print only the effective user ID
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-z, --zero delimit entries with NUL characters, not whitespace;not permitted in default format
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如果不附带任何选项，程序会显示一些可供识别用户身份的有用信息
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```
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## 实例
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```bash
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id
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```
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