I would check out the 'join' utility. If you have two files, A and B, comma-delimited, they are -sorted- (see the sort utility), and you want all lines that have the first column in common, then:
join -j 1 -t ',' A B
This ought to work fine! Then just iterate across all of the files, iterating as suits you best.
Mark

In reply to Re: How to combine multiple files together by Anonymous Monk
in thread How to combine multiple files together by xspikx

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