<https://www.cnblogs.com/chengmo/archive/2010/10/20/1855805.html>
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2>&1的含义：
<http://blog.csdn.net/ggxiaobai/article/details/53507530>
<https://www.cnblogs.com/zhenghongxin/p/7029173.html>
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一个优秀的linux博客： <http://www.cnblogs.com/chengmo/>