makepatch

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makepatch
The makepatch package contains two programs, both written in Perl: makepatch and applypatch. makepatch will generate a patch kit from two source trees. It traverses the source directory and runs a 'diff' on each pair of corresponding files, accumulating the output into a patch kit. The applypatch program will do the following:

It will extensively verify that the patch kit is complete and not corrupted during transfer.
It will apply some heuristics to verify that the directory in which the patch will be applied does indeed contain the expected sources.
It creates files and directories as necessary.
It applies the patch by running the 'patch' program.
Upon completion, obsolete files, directories and .orig files are removed, file modes of new files are set, and the timestamps of all patched files are adjusted.