我记得之前去XX网面试的那个面试题是这样的：有个apache.log?文件文本内容如下：
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[niewj@centSvr?~]$?cat?apache.log?????????
http://www.163.com/1.html
http://www.sohu.com/index.html
http://www.sina.com/index.html
http://www.sohu.com/3.html
http://www.163.com/2.html
http://www.163.com/3.html
======================
要求统计出结果如下的内容：
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??????3?www.163.com
??????1?www.sina.com
??????2?www.sohu.com
======================
我找到方法了，当初请教各位大神，各位给的awk/sed什么的，把我吓呆了，我用cut/sort/uniq实现了：如下：一步一步看走：
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[niewj@centSvr?~]$?cut?-d/?-f3?apache.log?
www.163.com
www.sohu.com
www.sina.com
www.sohu.com
www.163.com
www.163.com
[niewj@centSvr?~]$?cut?-d/?-f3?apache.log?|uniq?-c
??????1?www.163.com
??????1?www.sohu.com
??????1?www.sina.com
??????1?www.sohu.com
??????2?www.163.com
[niewj@centSvr?~]$?cut?-d/?-f3?apache.log?|sort?|uniq?-c?
??????3?www.163.com
??????1?www.sina.com
??????2?www.sohu.com
?
结果便出来了。好强大，学了都是自个的！！！
原文：http://niewj.iteye.com/blog/2152829