epatch

epatch is an alias for `ediff-patch-file' in `ediff.el'.


(epatch &optional ARG PATCH-BUF)

Query for a file name, and then run Ediff by patching that file.
If optional PATCH-BUF is given, use the patch in that buffer
and don't ask the user.
If prefix argument, then: if even argument, assume that the patch is in a
buffer. If odd -- assume it is in a file.