-quiet -q
Make GenPatch more quiet. Normally it informs you about all the processing it does. Using this option you reduce the amount of information displayed. It will e.g. no longer inform you about skipped files, etc.
-quiet-progress -qp
Disable the percentage progress meter. Will speed up GenPatch on large amounts of small files since output of these files take the longest time of the patching process in many cases, so it may make sense to disable it.