to clarify: there\'s only one rails command, which gets installed from the latest Rails gem, which is Rails 3 ATM. However, I\'m required to create a Rails 2.3 app.
Install rvm and then create a new gemset, so that Rails 2 is isolated.
Or, go to the directory where you want your Rails 2 app to be, create a Gemfile like a Rails 3 app, but specify gem "rails", "~> 2.3" and run bundle install, and you should now be able to issue rails .