--- Open3.popen3(cmd)
      ץcmd¹ԤΥץɸϡɸϡ
      ɸ२顼Ϥ³줿ѥפ3Ǥ֤
      cmd  exec [Ȥ߹ߴؿ]Ʊ§ǲᤵ롣

      ֥åꤹȥѥפ˥֥å¹ԤǸ
      ѥפ close 롣ξϥ֥åκǸμη̤֤

        require 'open3'

        Open3.popen3("read stdin; echo stdout; echo stderr >&2") {|stdin, stdout, stderr|

          stdin.puts "stdin"
          p stdout.read
          p stderr.read
        }
        #=> "stdout\n"
            "stderr\n"

