join(1) on FreeBSD
The text cdd75d07ff81, as FreeBSD 2.2.2-RELEASE, FreeBSD 2.1.7.1-RELEASE, FreeBSD 2.1.7-RELEASE, FreeBSD 2.1.5-RELEASE, FreeBSD 2.0.5-RELEASE shipped it.
relational database operator
Flags it lists
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-1 -
-2 -
-a -
-e -
-o -
-t -
-v