1、查看在线用户

[root@dbserver01 ~]# w
16:45:04 up 16 days, 8:48, 1 user, load average: 0.08, 0.07, 0.05
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
oracle pts/0 192.168.1.116 15:18 0.00s 1:16 0.03s sshd: oracle [priv]

 2、查看用户登录历史：

[root@dbserver01 ~]# last

oracle pts/0 192.168.1.116 Mon Jul 1 15:18 still logged in
oracle pts/0 192.168.1.116 Tue Jun 25 17:39 - 18:04 (00:25)
oracle pts/0 192.168.1.116 Tue Jun 25 17:13 - 17:14 (00:00)
oracle pts/1 192.168.1.116 Tue Jun 25 15:05 - 15:07 (00:01)
oracle pts/0 192.168.1.116 Tue Jun 25 11:20 - 15:12 (03:51)

 3、踢出用户：

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