printf(" -P port connect to specified port\n");
printf(" -pw passw login with specified password\n");
printf(" -1 -2 force use of particular SSH protocol version\n");
+ printf(" -4 -6 force use of IPv4 or IPv6\n");
printf(" -C enable compression\n");
printf(" -i key private key file for authentication\n");
printf(" -batch disable all interactive prompts\n");