exec.go

        cmd := exec.Command("ruby", "test.rb")
	stdout, err := cmd.StdoutPipe()
	if err != nil {
		fmt.Println(err)
	}
	stderr, err := cmd.StderrPipe()
	if err != nil {
		fmt.Println(err)
	}
	err = cmd.Start()
	if err != nil {
		fmt.Println(err)
	}
	go io.Copy(os.Stdout, stdout)
	go io.Copy(os.Stderr, stderr)
	cmd.Wait()