求助一个对比文件的shell

limaoyuan

有a.txt和b.txt二个文件，需要找出a.txt中等号之前的部分在b.txt中对应的逗号之前的数字是什么，并把数字填加回a.txt或重定向到一个新的文件中。

a.txt
/js/a.js=/Users/limy/work/svntest/project/jsp/index.jsp
/css/v11/c.css=/Users/limy/work/svntest/project/jsp/index.jsp
/css/v8/lpt/lpt.css=/Users/limy/work/svntest/project/jsp/index.jsp
/css/d/d.css=/Users/limy/work/svntest/project/jsp/index.jsp
/css/v9/b.css=/Users/limy/work/svntest/project/jsp/index.jsp
/js/a.js=/Users/limy/work/svntest/project/jsp/index2wq.jsp
/css/v11/c.css=/Users/limy/work/svntest/project/jsp/index2wq.jsp
/css/v8/lpt/lpt.css=/Users/limy/work/svntest/project/jsp/index2wq.jsp
/css/d/d.css=/Users/limy/work/svntest/project/jsp/index2wq.jsp
/css/v9/b.css=/Users/limy/work/svntest/project/jsp/index2wq.jsp

b.txt
135666,/css/v11/c.css
135666,/css/v8/lpt/lpt.css
135659,/css/v8/v8.css
135663,/css/v9/b.css
135642,/js/a.js
135669,/jsp/index.jsp
135657,/pics/a.jpg
135642,/pics/b.jpg


希望的结果是：
得到c.txt
135642/js/a.js=/Users/limy/work/svntest/project/jsp/index.jsp
135666/css/v11/c.css=/Users/limy/work/svntest/project/jsp/index.jsp
135666/css/v8/lpt/lpt.css=/Users/limy/work/svntest/project/jsp/index.jsp
等等....

关阴月飞

1. awk -F '[,=]' 'FNR==NR{a[$2]=$1;next}a[$1]!=""{print a[$1] $0}'  b.txt a.txt >c.txt

复制代码

limaoyuan

回复 2# 关阴月飞


    谢谢您的回复，明天我研究学习一下，我目前用了个最笨的办法，着急实现，谢谢。

tingtx

关阴月飞 发表于 2014-06-20 23:37

好高端的用法啊

用户名注册后不能更改

回复 2# 关阴月飞

a[$1]!="" ≈ a[$1]
两者仅在a[$1]=0的时候有差别。

关阴月飞

回复 5# 用户名注册后不能更改


    防侧漏， a[$1] 直接这样写，肯定会被debug