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Seems this would not be a deterministic thing, or is there a way to do this reliably?
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Zcmp and zdiff are used to invoke the cmp or the diff program on files compressed via gzip. All options specified are passed directly to cmp or diff. If only 1 file is specified, then the files compared are file1 and an uncompressed file1. gz.
Beyond Compare has the ability to create ZIP files from files and folders in a Folder Compare session.
Zipping zips is fine. If there is a problem, that would be a bug in the compression software :). You will probably not get any further compression for those files though unless you're using a higher level of compression.
If you're using gzip, you can do something like this:
# diff <(zcat file1.gz) <(zcat file2.gz)
Reliable: unzip both, diff.
I have no idea if that answer's good enough for your use, but it works.
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