es(1) on Linux
The text d4d3141ba57e, as Debian 1.3 (Bo), Debian 1.2 (Rex), Debian 1.1 (Buzz) shipped it.
extensible shell
Flags it lists
-
-c -
-d -
-e -
-i -
-l -
-n -
-o -
-p -
-s -
-v -
-x