rcs(1) on OpenBSD
The text c2dda4018a8e, as OpenBSD 6.2, OpenBSD 6.1, OpenBSD 6.0, OpenBSD 5.9 shipped it.
RCS file management program
Flags it lists
-
-A -
-I -
-L -
-T -
-U -
-V -
-a -
-b -
-c -
-e -
-i -
-k -
-l -
-m -
-o -
-q -
-t -
-u -
-x