whois record for website

$ ping ${WEBSITE_URL:? & $PID=$! | sleep 2; | kill $PID
$ ping ${WEBSITE_URL:? & $PID=$! | sleep 2; | kill $PID
$ curl http://ip-api.com/json/172.67.197.83 | json_pp > /tmp/whois.out
$ grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b") /tmp/whois.out | uniq
$ rm /tmp/whois.out

Looking for the pid and killing:

ps -aux | grep