checkdomainserialnumbers

    #!/bin/bash
    # Linux shell script to check BIND named domain serial numbers across name servers
    # This script uses dig to retreive DNS information, make sure it is installed, apt-get install netutils
    # Tested on RHEL, Fedora, Centos and Debian Linux
    # -------------------------------------------------------------------------
    # Copyright (c) 2010 Myles McNamara <get@smyl.es>
    # This script is licensed under GNU GPL version 2.0 or above
    # -------------------------------------------------------------------------
    # Last updated on : March-2009.
    # -------------------------------------------------------------------------

    # opt=`getopt $*`
    #

    # Check for domain 
    [ $# -le 1 ] && { echo "Usage: $0 nameserver1 nameserver2 domain"; exit 1; }

    # Get serial numbers using dig and the specific DNS servers
    Sl=$(dig @$1 $3 +nssearch | cut -d' ' -f4)
    S2=$(dig @$2 $3 +nssearch | cut -d' ' -f4)
echo $S1 $S2
    # Compare serial numbers
    if(($S1==$S2)); then
    echo "Serial numbers match, the DNS records are the same."
    fi
    echo "The DNS records are NOT the same."