1、查询在线用户：
[root@leekwen ~]# w
09:18:37 up 22:30, 4 users, load average: 0.00, 0.02, 0.00
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT
root pts/2 122.224.121.194 09:03 13:56 0.01s 0.00s tail -f /var/lo
root pts/4 122.224.121.194 09:05 6:16 0.01s 0.01s -bash
root pts/5 122.224.121.194 09:09 0.00s 0.03s 0.00s w
root pts/3 122.224.121.194 09:17 0.00s 0.01s 0.01s -bash
2、查询pts/2 客户端运行的程序：
[root@leekwen ~]# ps -ef |grep pts/2
root 8998 1418 0 09:03 ? 00:00:00 sshd: root@pts/2
root 9000 8998 0 09:03 pts/2 00:00:00 -bash
root 9072 9000 0 09:04 pts/2 00:00:00 tail -f /var/log/messages
root 9702 9283 0 09:18 pts/5 00:00:00 grep pts/2
3、剔除pts/2 客户端：
[root@leekwen ~]# kill -9 9000
[root@leekwen ~]# ps -ef |grep pts/2
root 8998 1418 0 09:03 ? 00:00:00 sshd: root@pts/2
root 9763 9283 0 09:18 pts/5 00:00:00 grep pts/2
[root@leekwen ~]# ps -ef |grep pts
root 8998 1418 0 09:03 ? 00:00:00 sshd: root@pts/2
root 9088 1418 0 09:05 ? 00:00:00 sshd: root@pts/4
root 9090 9088 0 09:05 pts/4 00:00:00 -bash
root 9281 1418 0 09:09 ? 00:00:00 sshd: root@pts/5
root 9283 9281 0 09:09 pts/5 00:00:00 -bash
root 9569 1418 0 09:17 ? 00:00:00 sshd: root@pts/3
root 9572 9569 0 09:17 pts/3 00:00:00 -bash
root 9787 9283 0 09:18 pts/5 00:00:00 ps -ef
root 9788 9283 0 09:18 pts/5 00:00:00 grep pts
