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Last updated March 15, 2016.
You can reverse a patch if you have finished testing it, or if you want to see whether a problem has been introduced by a particular patch. You should also reverse a patch prior to adding a newer, updated version of the same patch. To reverse the patch, use the patch command with the -R option:
patch -p1 -R < path/file.patch
(If your patch was applied with the -p0 option, use that instead.)
git apply -R path/file.patch