Show us what you have tried and we'll help you sort out the problem areas. It helps us a lot to help you if you provide a small test script we can run without having to mock up your test environment. See I know what I mean. Why don't you? for tips on how to generate any files you might need for the test script.

Note that to test your solution you can probably get away with a couple of short files and only require 2 (instead of 25) "matches among all of them".

Premature optimization is the root of all job security

In reply to Re: Extracting common keys present in multiple files by GrandFather
in thread Extracting common keys present in multiple files by Anonymous Monk

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