Linux awk

http://www.runoob.com/linux/linux-comm-awk.html

awk 去除重复行

http://edyfox.codecarver.org/html/bash_unique_lines_no_sorting.html

http://www.cnblogs.com/ggjucheng/archive/2013/01/13/2858470.html

awk中如何输出单引号

 http://www.cnblogs.com/rootq/articles/1417138.html