# File lib/main/daemon.rb, line 244
    def cmd_pid
      pid = Integer(IO.read(@pid_file)) rescue nil

      if pid
        begin
          Process.kill(0, pid)
          puts(pid)
          exit(0)
        rescue Errno::ESRCH
          exit(1)
        end
      else
        exit(1)
      end

      exit(1)
    end