# 查看用户登录记录

有关用户登录的信息记录在 utmp(/var/run/utmp)、wtmp(/var/log/wtmp)、btmp(/var/log/btmp) 和 lastlog(/var/log/lastlog) 等文件中。

```bash
who、w 和 users 等命令通过 utmp(/var/run/utmp) 文件查询当前登录用户的信息。
last 和 ac 命令通过 wtmp(/var/log/wtmp) 文件查询当前与过去登录系统的用户的信息。
lastb 命令通过 btmp(/var/log/btmp) 文件查询所有登录系统失败的用户的信息。
lastlog 命令通过 lastlog(/var/log/lastlog) 文件查询用户最后一次登录的信息。
```

**who 命令：显示当前当登录的用户的信息**

```bash
who
root    pts/0        2022-04-07 18:39 (172.16.33.160)
```

**w 命令：显示登录的用户及其当前执行的任务**

```bash
w
 18:46:05 up  9:18,  1 user,  load average: 0.00, 0.00, 0.00
USER     TTY      FROM             LOGIN@   IDLE   JCPU   PCPU WHAT
jilan    pts/0    172.16.33.160    18:39    1.00s  0.06s  0.00s w
```

**users 命令：显示当前当登录的用户的用户名**

```bash
users
root
```

**last 命令：显示当前与过去登录系统的用户的信息**

```bash
jilan    pts/0        172.16.33.160    Thu Apr  7 18:39   still logged in
jilan    pts/1        172.16.33.160    Thu Apr  7 18:28 - 18:39  (00:10)
jilan    pts/0        172.16.33.160    Thu Apr  7 15:24 - 18:37  (03:12)
jilan    pts/0        172.16.33.160    Thu Apr  7 14:54 - 14:56  (00:01)
jilan    pts/0        172.16.33.160    Thu Apr  7 09:54 - 13:02  (03:07)
reboot   system boot  4.15.0-175-gener Thu Apr  7 09:27   still running
jilan    pts/1        172.16.33.160    Wed Apr  6 15:05 - 22:49  (07:44)
jilan    pts/0        172.16.33.160    Wed Apr  6 10:00 - 15:11  (05:10)
```


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