join(1) on FreeBSD
The text e493af09f98a, as FreeBSD 5.2.1-RELEASE, FreeBSD 5.2-RELEASE, FreeBSD 5.1-RELEASE, FreeBSD 5.0-RELEASE shipped it.
relational database operator
Flags it lists
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-1 -
-2 -
-a -
-e -
-o -
-t -
-v