Hmm, I've just found out that file1 may have more records than file2. In which case I would need to remove the entry when the file merge (file3) is done.

Can all this be done in one pass or will I have to make several file passes to make this work ?
I don't know enough perl (yet) to know if this is possible.

In reply to Re^3: file compare and populate by Anonymous Monk
in thread file compare and populate by Anonymous Monk

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