# File lib/chef/provider/group.rb, line 107
      def action_modify
        if @group_exists 
          if compare_group
            manage_group
            @new_resource.updated_by_last_action(true)
            Chef::Log.info("#{@new_resource} modified")
          end
        else
          raise Chef::Exceptions::Group, "Cannot modify #{@new_resource} - group does not exist!"
        end
      end