sdiff(1) on OpenBSD
The text 4b1e7a13ecbd, as OpenBSD 5.6, OpenBSD 5.5, OpenBSD 5.4 shipped it.
side-by-side diff
Flags it lists
-
-I -
-W -
-a -
-b -
-d -
-i -
-l -
-o -
-s -
-t -
-w