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.
rails
(I assume 2.3.11, given it's the latest)
rails _2.3.11_ new app will do this for you without you having to muck about.
rails _2.3.11_ new app