First let's install Guard: https://github.com/guard/guard
gem install guard
guard init
gem install rb-fsevent
gem install growl
gem install rb-inotify
gem install libnotify
Next We install Guard Cucumber: https://github.com/guard/guard-cucumber
gem install guard-cucumber
guard init cucumber
Next We install Guard Rspec: https://github.com/guard/guard-rspec
gem install guard-rspec
guard init rspec
Next we install the Gurad Spork: https://github.com/guard/guard-spork
gem install guard-spork
guard init spork
That's all you need to start the guard's generators take care of the initial configuration.
You can find a list of available guards here: https://github.com/guard/guard/wiki/List-of-available-Guards