My Ubuntu Software Center shows Ruby 1.8 nstalledbut Ruby is not
accessible from the my terminal:

$ ruby -v
The program 'ruby' is currently not installed.  You can install it by
typing:
sudo apt-get install ruby
$ printenv PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/home/wolf/.gem/ruby/1.8/bin
$ cucumber codebreaker_starts_game.feature
Feature: code-breaker starts game

Cucumber is a Ruby framework.  Cucumber is working but Ruby does not.
How is that possible?  How can I run Ruby from my terminal?

Thank you.