diff(1) on OpenBSD
The text 7c2b7203afb3, as OpenBSD 3.6 shipped it.
differential file and directory comparator
Flags it lists
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-b -
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-f -
-i -
-l -
-n -
-p -
-q -
-r -
-s -
-t -
-u -
-w -
-x