tabs(1) on Linux
The text b3c39df55b3b, as Debian 9 (Stretch) shipped it.
set tabs on a terminal
Flags it lists
-
-T -
-V -
-a -
-a2 -
-c -
-c2 -
-c3 -
-d -
-f -
-n -
-p -
-s -
-u