Sometimes when comparing two directories, the first directory contains a
file that the second directory does not.  If you give diff the
`-N' or `--new-file' option, it outputs a diff that deletes
the contents of this file.  By default, patch leaves an empty
file after applying such a diff.  The `-E' or
`--remove-empty-files' option to patch deletes output files
that are empty after applying the diff.
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