join(1) on macOS
The text e057fabb2d2f, as Mac OS X 10.5.8, Mac OS X 10.5.7, Mac OS X 10.5.6, Mac OS X 10.5.5, Mac OS X 10.5.4, Mac OS X 10.5.3, Mac OS X 10.5.2, Mac OS X 10.5.1, Mac OS X 10.5 shipped it.
relational database operator
Flags it lists
-
-1 -
-2 -
-a -
-e -
-o -
-t -
-v