added debug of user information

	flag.StringVar(&cmd, "command", "hostname -f", "command to execute")

	flag.Parse()

	// show some information

	if debug {

		fmt.Fprintf(os.Stderr, "   login: %s\n", login)

		fmt.Fprintf(os.Stderr, "username: %s\n", u.Username)

		fmt.Fprintf(os.Stderr, "    name: %s\n", u.Name)

		fmt.Fprintf(os.Stderr, "     uid: %s\n", u.Uid)

		fmt.Fprintf(os.Stderr, "     gid: %s\n", u.Gid)

		fmt.Fprintf(os.Stderr, "home dir: %s\n", u.HomeDir)

	}

	// load user's known hosts

	if callbackHostKey, err = knownhosts.New(fmt.Sprintf(formatUserSSHKnownHosts, u.HomeDir)); err != nil {

		panic(err)