sdiff(1) on OpenBSD
The text 74a888ba3cbe, as OpenBSD 6.2, OpenBSD 6.1, OpenBSD 6.0, OpenBSD 5.9, OpenBSD 5.8, OpenBSD 5.7 shipped it.
side-by-side diff
Flags it lists
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-I -
-W -
-a -
-b -
-d -
-i -
-l -
-o -
-s -
-t -
-w