He says so right here.
Ruby was also the clear winner of my recent “help me pick a language” poll. So how do I get started? And how long until I can start doing useful stuff? All pointers appreciated. Remember, I need mac-specific implementation guidance. I’m just going to go with the ruby built into my Mac. where ruby tells me that ruby is installed into both /usr/bin/ruby and /usr/local/bin/ruby.
% ruby --version ruby 1.8.2 (2004-12-25) [powerpc-darwin8.0]