[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