# File lib/rubygems/gem_commands.rb, line 334
    def execute
      locals = Gem::SourceIndex.from_installed_gems
      locals.outdated.each do |name|
        local = locals.search(/^#{name}$/).last
        remote = Gem::SourceInfoCache.search(/^#{name}$/).last
        say "#{local.name} (#{local.version} < #{remote.version})"
      end
    end