es(1) on Linux
The text ff2401b9ce53, as Debian 3.1 (Sarge), Debian 3.0 (Woody), Debian 2.2 (Potato), Debian 2.1 (Slink) shipped it.
extensible shell
Flags it lists
-
-c -
-d -
-e -
-i -
-l -
-n -
-o -
-p -
-s -
-v -
-x