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who
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===
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显示目前登录系统的用户信息
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## 补充说明
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**who命令** 是显示目前登录系统的用户信息。执行who命令可得知目前有那些用户登入系统，单独执行who命令会列出登入帐号，使用的终端机，登入时间以及从何处登入或正在使用哪个X显示器。
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### 语法
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```
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who(选项)(参数)
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```
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### 选项
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```
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-H或--heading：显示各栏位的标题信息列；
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-i或-u或--idle：显示闲置时间，若该用户在前一分钟之内有进行任何动作，将标示成"."号，如果该用户已超过24小时没有任何动作，则标示出"old"字符串；
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-m：此参数的效果和指定"am i"字符串相同；
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-q或--count：只显示登入系统的帐号名称和总人数；
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-s：此参数将忽略不予处理，仅负责解决who指令其他版本的兼容性问题；
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-w或-T或--mesg或--message或--writable：显示用户的信息状态栏；
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--help：在线帮助；
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--version：显示版本信息。
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```
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### 参数
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文件：指定查询文件。
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### 实例
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```
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[root@localhost ~]# who
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root pts/0 2013-08-19 15:04 (192.168.0.134)
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root pts/1 2013-12-20 10:37 (180.111.155.40)
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[root@localhost ~]# who -q
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root root
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# users=2
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[root@localhost ~]# who -H
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NAME LINE time COMMENT
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root pts/0 2013-08-19 15:04 (192.168.0.134)
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root pts/1 2013-12-20 10:37 (180.111.155.40)
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[root@localhost ~]# who -w
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root + pts/0 2013-08-19 15:04 (192.168.0.134)
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root + pts/1 2013-12-20 10:37 (180.111.155.40)
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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