[置顶] Linux 精萃

– Start 
grep 精萃 
awk 精萃 
sed 精萃 
ksh 精萃 
Perl 精萃 
正则表达式精萃

– 声 明：转载请注明出处 
– Last Updated on 2015-10-29 
– Written by ShangBo on 2015-10-23 
– End

FROM:  http://blog.youkuaiyun.com/shangboerds/article/details/49358369