Welcome to the CBA wiki!
curl -o install_cba.rb https://raw.github.com/iboard/CBA/master/install.rb
You'll be asked for the directory to create. No need to mkdir before.
The install_cba.rb will do
Then you have to do:
If you'll run in troubles, please visit https://github.com/iboard/CBA/issues
Andreas Altendorfer, @Nickendell
A demo-server and the official website for this project is running at http://cba.iboard.cc