qu__
qu___
http://topic.csdn.net/t/20050729/09/4175690.html
http://www.leadfrenzy.net/index.php?entry=entry100822-163608
http://cooker.iteye.com/blog/777455
http://blog.csdn.net/donhao/archive/2010/06/02/5641956.aspx
http://www.grymoire.com/Unix/Awk.html#uh-0
