Debian Linux (Sarge) 에서 지원되는 ruby의 버전이 낮으니 될 수 있으면, Debian Linux (Etch) 를 사용하기를 권고한다.
다음과 같이 설치하면 된다.
# apt-get install ruby irb ri rdoc ruby1.8-dev
The irb is acronym for Interactive RuBy. It evaluates Ruby expression from the terminal.
ri is a command line tool that displays descriptions of built-in Ruby methods, classes, and modules. For methods, it shows you the calling sequence and a description. For classes and modules, it shows a synopsis along with a list of the methods the class or module implements.