Linux查看当前登录用户并踢出用户

[wilsh@lcl ~]$ whatis w
w                    (1)  - Show who is logged on and what they are doing
[wilsh@lcl ~]$ w
09:49:30 up 1 day, 17:19,  4 users,  load average: 0.00, 0.00, 0.00
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
root     tty3     -                09:25   23:25   0.10s  0.08s -bash
root     pts/0    192.168.105.188  09:32    9:38   0.02s  0.02s -bash
root     pts/1    192.168.105.188  09:36    9:32   0.03s  0.02s -bash
wilsh    pts/2    192.168.105.188  09:41    0.00s  0.00s  0.00s w

[wilsh@lcl ~]$ whatis pkill
pkill [pgrep]        (1)  - look up or signal processes based on name and other attributes

[wilsh@lcl ~]$ pkill -KILL -u wilsh #-u用来指定用户名

[wilsh@lcl ~]$ pkill -9 -u wilsh # -KILL -9都是可以的。

[wilsh@lcl ~]$ pkill -KILL -t pts/2
[wilsh@lcl ~]$ pkill -KILL -t /dev/pts/2 # 这种写法是错误的。因为在man page中明确说明，如果要使用-t参数，那么就不能带/dev/前辍。<span style="color:#FF99FF;"><span style="background-color: rgb(255, 255, 153);">#在centos6.7 kernel 3.10.28中测试，发现写完整的设备名并不起作用（如/dev/pts/2）,本文是在kernel 2.6.32中写的，昨天晚上刚刚重启编译完3.10.28的内核，测试了一下又不可以了，郁闷。</span></span>

[wilsh@lcl ~]$ whatis skill
skill                (1)  - send a signal or report process status

[wilsh@lcl ~]$ skill -9 -t pts/2

[wilsh@lcl ~]$ w
 09:57:37 up 1 day, 17:28,  4 users,  load average: 0.00, 0.00, 0.00
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
root     tty3     -                09:25   31:32   0.10s  0.08s -bash
root     pts/0    192.168.105.188  09:32   17:45   0.02s  0.02s -bash
root     pts/1    192.168.105.188  09:36   17:39   0.01s  0.01s -bash
wilsh    pts/2    192.168.105.188  09:57    0.00s  0.00s  0.00s w
[wilsh@lcl ~]$ skill -9 -u wilsh