Use a hash to store all lines of the ID file with Catg_ID as key and the other values as data (as a string "12 16"). This should hopefully still fit into memory, if not use something like DMB::Deep to store the hash on disk

Then just read the Name file line by line, check for the ID in the hash and compare.

In reply to Re: Comparing multiple entries from two files by jethro
in thread Comparing multiple entries from two files by hanger4

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