Patch mystery (at least partly) solved.

[Dave Korn]

  This makes things seem a good deal clearer, at least to me:

http://savannah.gnu.org/projects/diffutils/

-----------------------------<quote>-----------------------------
This project is part of the GNU Project.

The GNU diffutils are comprised of diff, diff3, sdiff, and cmp, utilities for
showing differences between files. The manual also documents patch, which uses
diff output to update files.

We'd like to add the wdiff and patch utilities, as well as maintain the
utilities more actively. If you can volunteer to help with this, please email
maintainers@gnu.org. (The prerelease version on alpha.gnu.org has the latest
available source, if you want to peruse.)
-----------------------------<quote>-----------------------------


    cheers, 
      DaveK
-- 
Can't think of a witty .sigline today....


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