tabs(1) on Linux
The text 863b16cc541e, as Debian 5.0 (Lenny) shipped it.
set tabs on a terminal
Flags it lists
-
-T -
-a -
-a2 -
-c -
-c2 -
-c3 -
-d -
-f -
-n -
-p -
-s -
-u