Ruby Switcher

chruby () {
  v=`ruby -e "puts RUBY_VERSION.split('.')[0,2].join('.')"`
  if [ $v = "1.9" ]; then 
    cv="1.8"
  else
    cv="1.9"
  fi
  rubyexes=(erb gem irb rake rdoc ri ruby testrb)
  for i in ${rubyexes[*]}; do
    sudo unlink "/opt/local/bin/${i}"
    sudo ln -s "/opt/local/bin/${i}${cv}" "/opt/local/bin/${i}"
  done
  echo "Now Running: "`ruby -v`
}