ed(1) on Linux
The text 12815b29f37d, as Debian 11 (Bullseye) shipped it.
line-oriented text editor
Flags it lists
-
--extended-regexp -
--help -
--loose-exit-status -
--prompt -
--quiet -
--restricted -
--silent -
--traditional -
--verbose -
--version -
-E -
-G -
-V -
-h -
-l -
-p -
-r -
-s -
-v