Parsing script for grepable masscan output to get specific ports
Argument list
-iplist : grepable output (-oG)
-port : port number wanted to be filtered
-portlist : list of port to be filtered
Usage : Script -iplist -port OR Script -iplist -portlist
Example : Script -iplist iplist.gnmap -port 53
Example : Script -iplist iplist.gnmap -portlist 23,53