istefy

if [ "$#" -eq 0 ] || [ "$#" -gt 2 ] || [[ $* == *--help* ]] || [[ $* == *-h* ]]; then                                                                                                                              
    echo "Usage ./getValidDNS.sh [output file] [optional: timeout (seconds)]"                                                                                                                                      
    exit 1                                                                                                                                                                                                         
fi