gistfile1.txt

old_gem = "gem"
new_gem = "/opt/ruby-enterprise/bin/gem"

oldgems = `#{old_gem} list`
# oldgems.each block written by spiceee.
# http://snippets.dzone.com/posts/show/6372
oldgems.each do |line|
  newgems = `#{new_gem} list`
  matches = line.match(/([A-Z].+) \(([0-9\., ]+)\)/i)
  if matches 
  then
    gem_name = matches[1]
    versions = matches[2]
    versions.split(', ').each do |ver|
      cmd = "#{new_gem} install #{gem_name} --version #{ver} --no-rdoc --no-ri"
      # rubygems-update is "installed" because REE includes RubyGems 1.3.1.
      if newgems =~ /#{gem_name} \(.*#{ver}.*\)/i || gem_name =~ /rubygems-update/
      then
        puts "#{gem_name} #{ver} is already installed. Skipping."
      else
        puts cmd
        system cmd
      end
    end
  end
end