http://www.cnblogs.com/ma6174/archive/2012/05/08/2490921.html
http://stevelosh.com/blog/2009/03/candy-colored-terminal/
http://www.ha97.com/book/OpenSource_Guide/ch30s04.html
http://zhuanlan.zhihu.com/mactalk/19556676
原文：http://www.cnblogs.com/yxzfscg/p/5052779.html