$ ruby script/generate controller Site
Rails requires RubyGems >= 1.3.1 (you have 1.2.0). Please `gem update --system` and try again.
matts-MacBook:qualitymatters matthew$ gem update --system
Updating RubyGems
Updating rubygems-update
ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions into the /usr/bin directory.
Various messings around later, and got success with:
$ sudo gem install rubygems-update
$ sudo update_rubygems
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