参考、推荐资料：
http://www.grymoire.com/Unix/Sed.html#uh-40 (很全)
http://www.linuxhowtos.org/System/sed_tutorial.htm (内容少、速成)
http://maketecheasier.com/beginners-guide-to-sed-linux/2012/03/29
http://how-to.linuxcareer.com/learning-linux-commands-[......]
sed常用方法与命令
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