ed(1) on Linux
The text ddf4d5e33d50, as Debian 7 (Wheezy) shipped it.
line-oriented text editor
Flags it lists
-
--help -
--loose-exit-status -
--prompt -
--quiet -
--restricted -
--silent -
--traditional -
--verbose -
--version -
-G -
-V -
-h -
-l -
-p -
-r -
-s -
-v