code: func runCmd(command string, args []string, dir string) error {
  	cmd := gos.Command(command, args...)
  	cmd.Stdout(os.Stderr)
  	cmd.Stderr(os.Stderr)
  	cmd.Dir(dir)
  	if err := cmd.Start(); err != nil {
  		return err
  	}
  	return cmd.Wait()
  }
docs: // runCmd is a helper function to run commands.
  // It runs command with args from directory at dir.
  // The executed process outputs to os.Stderr