irb(1) on Linux
The text a93e2cd5fe25, as Debian 9 (Stretch) shipped it.
Interactive Ruby Shell
Flags it lists
-
--back-trace-limit -
--encoding -
--help -
--inf-ruby-mode -
--inspect -
--irb_debug -
--noinspect -
--noprompt -
--noreadline -
--prompt -
--prompt-mode -
--readline -
--simple-prompt -
--tracer -
--version -
-E -
-I -
-U -
-d -
-f -
-h -
-m -
-r