http://blog.csdn.net/buutterfly/article/details/6615162

http://www.2cto.com/os/201307/224496.html

http://wenda.so.com/q/1365651781067621

http://www.cnblogs.com/luwikes/archive/2011/09/14/2176581.html

grep

http://blog.sina.com.cn/s/blog_406127500101dljv.html

awk:

http://www.linuxidc.com/Linux/2013-07/87047.htm

http://www.cnblogs.com/chengmo/archive/2010/10/08/1845913.html

mount:

http://www.cnblogs.com/chengmo/archive/2010/10/13/1850515.html

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