join(1) on OpenBSD
The text 2d42da823eb6, as OpenBSD 5.4, OpenBSD 5.3, OpenBSD 5.2, OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9 shipped it.
relational database operator
Flags it lists
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-1 -
-2 -
-a -
-e -
-o -
-t -
-v