bytes ( ';' LONG )*

/**
 * Format bytes
 */
public String _bytes(String[] args) {
    try (Formatter sb = new Formatter()) {
        for (int i = 0; i < args.length; i++) {
            long l = Long.parseLong(args[1]);
            bytes(sb, l, 0, new String[] {
                "b", "Kb", "Mb", "Gb", "Tb", "Pb", "Eb", "Zb", "Yb", "Bb", "Geopbyte"
            });
        }
        return sb.toString();
    }
}

private void bytes(Formatter sb, double l, int i, String[] strings) {
    if (l > 1024 && i < strings.length - 1) {
        bytes(sb, l / 1024, i + 1, strings);
        return;
    }
    l = Math.round(l * 10) / 10;
    sb.format("%s %s", l, strings[i]);
}