tabs(1) on macOS
The text bb15b418ec9f, 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.
set terminal tabs
Flags it lists
-
-T -
-a -
-a2 -
-c -
-c2 -
-c3 -
-f -
-n -
-p -
-s -
-u