# File lib/rubygems/commands/update_command.rb, line 79 def do_rubygems_update(version_string) update_dir = File.join(Gem.dir, "gems", "rubygems-update-#{version_string}") Dir.chdir(update_dir) do puts "Installing RubyGems #{version_string}" system "#{Gem.ruby} setup.rb" end end