1、查看在线用户
使用命令：w

[root@localhost ~]# w
 15:21:41 up 21 days, 16:27, 4 users, load average: 0.53, 1.29, 3.76
 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
 root pts/0 127.0.0.1 10:51 2:47m 14.16s 0.04s -bash
 root pts/1 127.0.0.1 14:03 1:18m 0.02s 0.02s -bash
 root pts/2 127.0.0.1 14:04 1:17m 0.02s 0.02s -bash
 root pts/3 127.0.0.1 14:09 5.00s 0.07s 0.07s -bash

2、查看用户登录历史：
last

[root@localhost ~]# last
 root pts/4 127.0.0.1 Tue Mar 29 15:18 - 15:19 (00:00)
 root pts/3 127.0.0.1 Tue Mar 29 14:09 still logged in
 root pts/2 127.0.0.1 Tue Mar 29 14:04 still logged in
 root pts/1 127.0.0.1 Tue Mar 29 14:03 still logged in
 root pts/0 127.0.0.1 Tue Mar 29 10:51 still logged in
 root pts/5 127.0.0.1 Mon Mar 28 21:53 - 22:52 (00:59)
 root pts/4 127.0.0.1 Mon Mar 28 14:01 - 00:46 (10:45)
 root pts/3 127.0.0.1 Mon Mar 28 11:39 - 00:46 (13:07)

3、踢出用户：

pkill -KILL -t pts/0 #pts/0为w指令看到的用户终端号

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