combinediff(1) on Linux
The text 71fe7e98dadb, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
create a cumulative unified patch from two incremental patches
Flags it lists
-
--combine -
--decompress -
--drop-context -
--help -
--ignore-all-space -
--ignore-blank-lines -
--ignore-case -
--ignore-space-change -
--interpolate -
--quiet -
--strip-match -
--unified -
--version -
-B -
-U -
-b -
-d -
-i -
-p -
-q -
-w -
-z