1.cut http://www.cnblogs.com/dong008259/archive/2011/12/09/2282679.html
2.sed http://www.cnblogs.com/dong008259/archive/2011/12/07/2279897.html
3.awk http://www.cnblogs.com/dong008259/archive/2011/12/06/2277287.html
原文：http://www.cnblogs.com/gaoyup/p/7222025.html