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This will update the tarball, adding files that have changed since the last update.
This assumes that the tarball is in the same directory as the files being archived.
N.B. This command can't be used on compressed tarballs.
N.B. This will add the updated files to the tarball, so that the tarball will have two versions of each file. This will make the tarball larger, but doesn't have any other significant effect.
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