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http://topic.youkuaiyun.com/t/20050729/09/4175690.html

http://www.leadfrenzy.net/index.php?entry=entry100822-163608

http://cooker.iteye.com/blog/777455

http://blog.youkuaiyun.com/donhao/archive/2010/06/02/5641956.aspx

http://www.grymoire.com/Unix/Awk.html#uh-0