# login

登录系统或切换用户身份

## 补充说明

**login命令** 用于给出登录界面，可用于重新登录或者切换用户身份，也可通过它的功能随时更换登入身份。在Slackware发行版中 ，您可在命令后面附加欲登入的用户名称，它会直接询问密码，等待用户输入。当`/etc/nologin`文件存在时，系统只root帐号登入系统，其他用户一律不准登入。

### 语法

```
login(选项)(参数)
```

### 选项

```
-p：告诉login指令不销毁环境变量；
-h：指定远程服务器的主机名。
```

### 参数

用户名：指定登录使用的用户名。


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