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今天有个小需求，用 awk 和 sed 貌似不能很好的完成任务，打算转战 perl 了
source link: https://www.v2ex.com/t/514702
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程序员 - @hujianxin - 有一个文件，a.txt ，文容如下：```0689LM name=S:321, password=154adfv839473, value=374612782167231633LM n
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