1. This is a collection of programs that can manipulate patch files ina variety of ways, such as interpolating between two pre-patches, combining two incremental patches, fixing line numbers in hand-edited patches, and simply listing the files modified by a patch. From Redhat 8.0 RPM

2. Utilities to work with patches This package includes the following utilities: - combinediff creates a cumulative patch from two incremental patches - filterdiff extracts or excludes diffs from a diff file - fixcvsdiff fixes diff files created by CVS that "patch" mis-interprets - grepdiff shows which files are modified by a patch matching a regex - interdiff shows differences between two unified diff files - lsdiff shows which files are modified by a patch - rediff fixes offsets and counts of a hand-edited diff - splitdiff separates out incremental patches From Debian 3.0r0 APT