Obtain a Y or N response

my $TTY = open("/dev/tty");

sub prompt-char($prompt) {
    ENTER shell "stty raw -echo min 1 time 1";
    LEAVE shell "stty sane";

    print $prompt;
    $TTY.read(1).decode('latin1');
}

say so prompt-char("Y or N? ") ~~ /:i y/;