Matches a list of domains A-record against an expected IP

domains-check.sh

#!/bin/bash
# This script uses dig to retrieve the A record for domains
# Add your domains in a file called domains.txt, seperated by newlines
# Add your expected IP in a parameter -e=123.123.123.123
# Output is ok.txt with domains matching the IP, not-ok.txt with domains failing

# Parse parameters
for i in "$@"
do
case $i in
    -e=*|--expecting=*)
    EXPECTS="${i#*=}"
    shift # past argument=value
    ;;
    *)
          # unknown option
    ;;
esac
done

echo "EXPECTING: $EXPECTS"

while read domain
do

  # Get IP address defined in domain's root A-record
  ipaddress=`dig $domain +short`

  echo "Checking $domain"

  if [ "$ipaddress" = "$EXPECTS" ]; then

	echo -e "$domain OK" >> ok.txt

  else

	echo -e "$domain NOT OK: $ipaddress" >> not-ok.txt

  fi

# Defines the text file from which to read domain names
done < domains.txt