How to iterate over ipset and add new ips to it from a file?

Question

bash

How to iterate over ipset badips and add new ip abcd there if it is not in this list? Something like, but I don't know how:

sudo cat iplist.txt | while read line
do
 if($(ipset test badips $line)=='$line is NOT in set bots') sudo ipset -A badips $line
done

Answer 1

just add. if there is no address there, it will be added; if there is, it will be ignored.