PTARDIFF

ptardiff − program that diffs an extracted archive against an unextracted one

    ptardiff is a small program that diffs an extracted archive
    against an unextracted one, using the perl module Archive::Tar.

    This effectively lets you view changes made to an archives contents.

    Provide the progam with an ARCHIVE_FILE and it will look up all
    the files with in the archive, scan the current working directory
    for a file with the name and diff it against the contents of the
    archive.

    ptardiff ARCHIVE_FILE
    ptardiff −h

    $ tar −xzf Acme−Buffy−1.3.tar.gz
    $ vi Acme−Buffy−1.3/README
    [...]
    $ ptardiff Acme−Buffy−1.3.tar.gz > README.patch

    h   Prints this help message

tar(1), Archive::Tar.