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# **id**
## 说明
**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（ ）
在大多数Linux系统中。要使用它，
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
`/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
## 选项
```markdown
-Z, --context print only the security context of the current user
-g, --group 仅打印有效的组ID
-G, --groups print all group IDs
-n, --name print a name instead of a number, for -ugG
-r, --real print the real ID instead of the effective ID, with -ugG
-u, --user print only the effective user ID
-z, --zero delimit entries with NUL characters, not whitespace;not permitted in default format
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
```
## 实例
```bash
```
