List all domains with missing A records

mass-dig.sh

#!/bin/sh

# this script lists only those domain names with missing A records

domainnames="www.google.de
foobar.google.de
www.heise.de"

for domain in $domainnames
do
	digresult=`dig +noall +answer $domain`
	if [ -z "$digresult" ]; then
		echo $domain
	fi
done