--R::
- Output diff in reverse.
-
--M::
- Detect renames; implies -p.
-
--C::
- Detect copies as well as renames; implies -p.
-
--r::
- This flag does not mean anything. It is there only to match
- git-diff-tree. Unlike git-diff-tree, git-diff-files always looks
- at all the subdirectories.
-
-