void usage()
{
    std::cerr << "Usage: " << whoami
              << " [-maxlen len | -no-ignorable | -old-ei] filename"
              << std::endl;
    exit(2);
}
void usage()
{
    std::cerr << "Usage: " << whoami
              << " [-maxlen len | -no-ignorable | -old-ei] filename"
              << std::endl;
    exit(2);
}