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http://blog.csdn.net/lzysystem/archive/2009/03/05/3960853.aspx
http://www.linuxidc.com/Linux/2009-06/20390.htm
http://www.linuxdiyf.com/viewarticle.php?id=163893
http://blog.sina.com.cn/s/blog_4ed66efa0100gfjx.html###
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