tabs(1) on Linux
The text b7afd20de1f2, as Debian 8 (Jessie) shipped it.
set tabs on a terminal
Flags it lists
-
-T -
-V -
-a -
-a2 -
-c -
-c2 -
-c3 -
-d -
-f -
-n -
-p -
-s -
-u