Goal: quickly create an RVM-backed rails app.

This assumes you have RVM Setup like I do.

I will typically start a new project off like so to create a new rails app (courtesy of RailsApps):

cd ~/railsprojects
mkdir palette
cd palette
rvm use ruby-2.0.0@palette --ruby-version --create
gem install rails
rails new . 
git init
git add .
git commit -m "Initial rails generation"
rails s

To see a fancier start to a project using RailsApps’ Rails Composer, visit their page or look at the post: MongoMapper with Rails QuickStart.