I have found the CMPPFM command (Compare Physical File Member) to be useful for much more than comparing source members. I have been using it against data files to test my application program changes before rolling them into production. I run a test of the program(s) prior to my changes and copy the updated files to a temporary library. I then run the program(s) with my modifications included. Using the CMPPFM, I compare the files from before and after the changes to identify any fields or records that are different between the two versions of the program(s). Often, the only differences found are timestamp fields, which is to be expected in files where they exist. Any other differences are researched to identify potential bugs.
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