switch between apple's ruby 1.8.6 and macports 1.9.1

switch between apple's ruby 1.8.6 and macport's 1.9.1 .sh

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