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last
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===
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列出目前与过去登入系统的用户相关信息
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## 补充说明
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**last命令** 用于显示用户最近登录信息。单独执行last命令，它会读取`/var/log/wtmp`的文件，并把该给文件的内容记录的登入系统的用户名单全部显示出来。
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### 语法
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```
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last(选项)(参数)
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```
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### 选项
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```
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-a：把从何处登入系统的主机名称或ip地址，显示在最后一行；
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-d：将IP地址转换成主机名称；
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-f <记录文件>：指定记录文件。
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-n <显示列数>或-<显示列数>：设置列出名单的显示列数；
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-R：不显示登入系统的主机名称或IP地址；
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-x：显示系统关机，重新开机，以及执行等级的改变等信息。
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```
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### 参数
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* 用户名：显示用户登录列表；
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* 终端：显示从指定终端的登录列表。
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### 实例
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last命令用了显示用户登录情况，以下是直接显示固定行数的记录：
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```
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last -10
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root pts/0 221.6.45.34 Tue Dec 17 09:40 still logged in
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root pts/0 221.6.45.34 Mon Dec 16 09:00 - 11:57 (02:56)
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root pts/0 222.94.97.122 Sun Dec 15 20:39 - 23:28 (02:48)
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root pts/0 222.95.209.80 Sat Dec 14 14:39 - 14:58 (00:18)
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root pts/0 221.6.45.34 Thu Dec 12 16:55 - 17:37 (00:41)
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root pts/0 49.65.139.195 Wed Dec 11 20:40 - 21:16 (00:35)
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root pts/0 49.65.139.195 Wed Dec 11 19:46 - 20:03 (00:17)
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root pts/0 221.6.45.34 Tue Dec 10 14:41 - 15:52 (01:10)
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root pts/0 221.6.45.34 Mon Dec 9 17:24 - 17:30 (00:06)
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root pts/0 221.6.45.34 Mon Dec 9 09:38 - 11:41 (02:02)
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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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