查看机器中登陆的用户

[root@chengest~]# w

16:29:02 up 2 days,  2:35,  5 users,  load average: 0.03, 0.05, 0.01

USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT

root     pts/1    :0.0             Tue15    2days  1:44   0.04s -bash

root     pts/2    :0.0             Tue15   46:42m  0.05s  0.05s bash

root     pts/3    :0.0             Tue15    2days  0.02s  0.02s bash

root     pts/4    172.20.52.114    14:17   58:48   0.16s  0.03s sqlplus

root     pts/5    172.20.52.114    15:31    0.00s  0.03s  0.00s w

我把pts/1踢掉（只有root才能去踢掉用户）

[root@chengest ~]# pkill -kill -t pts/1

[root@chengest ~]# pkill -kill -t pts/2

[root@chengest ~]# pkill -kill -t pts/3

查看是不是踢掉

[root@chengest ~]# w

 16:34:16 up 2 days,  2:40,  2 users,  load average: 0.00, 0.05, 0.02

USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT

root     pts/4    172.20.52.114    14:17    1:04m  0.16s  0.03s sqlplus

root     pts/5    172.20.52.114    15:31    0.00s  0.03s  0.00s w

root可以踢掉其他用户包括自己

查看机器中登陆的用户

[root@chengest~]# w

16:29:02 up 2 days,  2:35,  5 users,  load average: 0.03, 0.05, 0.01

USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT

root     pts/1    :0.0             Tue15    2days  1:44   0.04s -bash

root     pts/2    :0.0             Tue15   46:42m  0.05s  0.05s bash

root pts/3 :0.0 Tue15 2days 0.02s 0.02s bash

root pts/4 172.20.52.114 14:17 58:48 0.16s 0.03s sqlplus

root pts/5 172.20.52.114 15:31 0.00s 0.03s 0.00s w

我把pts/1踢掉（只有root才能去踢掉用户）

[root@chengest ~]# pkill -kill -t pts/1

[root@chengest ~]# pkill -kill -t pts/2

[root@chengest ~]# pkill -kill -t pts/3

查看是不是踢掉

[root@chengest ~]# w

16:34:16 up 2 days, 2:40, 2 users, load average: 0.00, 0.05, 0.02

USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT

root pts/4 172.20.52.114 14:17 1:04m 0.16s 0.03s sqlplus

root pts/5 172.20.52.114 15:31 0.00s 0.03s 0.00s w

root可以踢掉其他用户包括自己
    查看端口占用
    lsof  -i :22