Manage multiple ruby environments with RVM (Ruby Version Manager)
curl -sSL https://get.rvm.io | bash -s stable
source /home/john.smith/.rvm/scripts/rvm
rvm use --default 1.8.7-p374
bundle install
rvm list
rvm list gemsets
rvm gemset list
rvm gemset create <name>
rvm gemset use <name>
rvm install <Ruby version>
rvm system # Select distro Ruby
Install Gem into a version
rvm <Ruby version> do gem install <gem>
Install bundle with a version
rvm 1.9.3 do bundle install