说明：  Linux.O_Reilly.SED+and+AWK.pdf 详细讲解Unix环境下的sed和awk的语法和用法,这两个命令在Shell编程中占了很大的比重,而且对于处理文本有很好的帮助,方便对大型数据文本处理
(Linux.O_Reilly.SED+ and+ AWK.pdf explain in detail the Unix environment sed and awk' s syntax and usage, these two commands in the Shell programming accounted for a large proportion of the text and have a good deal for the help, facilitate the processing of large data text)