- fprintf(stderr, "Options:\n");
- fprintf(stderr, " -f file Read hosts or addresses from file.\n");
- fprintf(stderr, " -p port Connect to the specified port.\n");
- fprintf(stderr, " -t keytype Specify the host key type.\n");
- fprintf(stderr, " -T timeout Set connection timeout.\n");
- fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
- fprintf(stderr, " -4 Use IPv4 only.\n");
- fprintf(stderr, " -6 Use IPv6 only.\n");