# File src/ruby_supportlib/phusion_passenger/config/utils.rb, line 108
      def list_all_passenger_instances(instances, print_preamble = true)
        if print_preamble
          puts "The following #{PROGRAM_NAME} instances are running:"
          puts
        end
        printf "%-25s  %-7s  %s\n", "Name", "PID", "Description"
        puts "--------------------------------------------------------------------------"
        if instances.empty?
          printf "%-25s  %-7s  %s\n", "(list empty)", "-", "-"
        else
          instances.each do |instance|
            printf "%-25s  %-7s  %s\n", instance.name, instance.watchdog_pid, instance.server_software
          end
        end
      end