分享一个linux有趣的功能

大家很多时候也和同事一起使用一台服务器吧，做后台开发的很多时候都用shell吧。现在分享一个整蛊同事的方法：
首先看一下连接服务器的都由谁？

//GD bgl-pub2:/home/d5000/kedong/bin % who
d5000    pts/0        2015-06-30 08:21 (192.168.200.5)
d5000    pts/1        2015-06-30 08:21 (192.168.200.5)
d5000    pts/3        2015-06-30 12:00 (192.168.200.105)
d5000    pts/4        2015-06-30 10:31 (192.168.200.38)
d5000    pts/6        2015-06-30 10:04 (192.168.200.6)
d5000    pts/8        2015-06-30 08:51 (192.168.200.43)
d5000    pts/9        2015-06-30 08:53 (192.168.200.43)
d5000    pts/10       2015-06-30 09:15 (192.168.200.42)
d5000    pts/12       2015-06-30 09:19 (192.168.200.42)
d5000    pts/13       2015-06-30 13:25 (192.168.200.38)
root     pts/14       2015-06-30 10:04 (127.0.0.1)
d5000    pts/15       2015-06-30 10:43 (192.168.200.6)
d5000    pts/16       2015-06-30 10:33 (192.168.200.31)
d5000    pts/17       2015-06-30 10:34 (192.168.200.6)
d5000    pts/18       2015-06-30 10:52 (192.168.200.139)
d5000    pts/19       2015-06-30 11:44 (192.168.200.5)
d5000    pts/20       2015-06-30 10:44 (192.168.200.139)
root     pts/21       2015-06-30 11:40 (127.0.0.1)
d5000    pts/22       2015-06-30 12:02 (192.168.200.5)
d5000    pts/23       2015-06-30 12:39 (192.168.200.41)
d5000    pts/24       2015-06-30 12:50 (192.168.200.42)
d5000    pts/25       2015-06-30 13:02 (192.168.200.139)
d5000    pts/26       2015-06-30 13:33 (192.168.200.41)
d5000    pts/27       2015-06-30 13:35 (192.168.200.139)
root     pts/28       2015-06-30 13:36 (127.0.0.1)

很多人，挑个同事整蛊一下，

//GD bgl-pub2:/home/d5000/kedong/bin % write d5000 pts/9
handsome boy, about this evening?

//GD bgl-pub2:/home/d5000/kedong/bin % write d5000 pts/9
          __
         /SS\
    /$$$$$$$$$$$$\
  /$$$$$$$$$$$$$$$$\
/$$$$$$$$$$$$$$$$$$$$$\
|$$$$$$$$$$$$$$$$$$$$$$\
|$$$$$            $$$$| 
|$$$$ ~M~      ~M~ $$$$|
|$$$       oo       $$|
|$$_   '        ' _ $|
|$$  \   |~~~~|  /  $  
|$$    \_______ /  
|$$      {----}
|$ 
 $ 

同事接到后电脑是这样滴：