ubuntu ruby with brightbox

.bashrc

# only bundler will be installed here
export GEM_HOME=/home/nick/.gems

# run this for new projects to put the gems and bins in the directory
alias bundle-bootstrap="bundle install --binstubs=.bundle/bin --path=.bundle/gems"

# switch to ruby 1.8
switch-ruby-1.8 ()
{
  sudo update-alternatives --set ruby /usr/bin/ruby1.8
  sudo update-alternatives --set gem /usr/bin/gem1.8
  gem install bundler
}
export -f switch-ruby-1.8

# switch to ruby 1.9
switch-ruby-1.9.1 ()
{
  sudo update-alternatives --set ruby /usr/bin/ruby1.9.1
  sudo update-alternatives --set gem /usr/bin/gem1.9.1
  gem install bundler
}
export -f switch-ruby-1.9.1

# have to re-install bundler to use the current ruby

# you could also use:
# ruby-switch --set ruby1.8

brightbox.sh

sudo apt-add-repository ppa:brightbox/ruby-ng-experimental
sudo apt-get update
sudo apt-get install ruby rubygems ruby-switch
sudo apt-get install ruby1.9.3