From: "Bartosz Dziewoński" <matma.rex@...>
Date: 2013-04-06T01:17:58+09:00
Subject: Re: Getting the input of an user with gets() before he hits Enter

Yes, using the 'io/console' library (included in stdlib). it provides, among other things, IO#getch.

require 'io/console'
while char = $stdin.getch
	puts "You pressed '#{char}'!"
end

-- 
Matma Rex