Use this script to check which of the domains contained in file are pointing to the given domain

check_domains.sh

#!/bin/bash

# Use this script to check which of the domains contained in file are pointing to the 
# given domain

# Credits: https://www.euperia.com/linux/howto-get-the-ip-address-of-a-domain-in-a-one-liner/385
# and various Stackoverflow users ^_^

if [ $# -eq 0 ]; then
	echo "Usage ${0##*/} path/to/file domain"
	exit 0
fi

file="$1"
domain="$2"

while read line; do
	if dig +short A ${line} | grep -q $2; then
		echo $line
	fi
done <$file