simple bash shell script adds an A record and a PTR for the passed fqdn/ip pair

addhost.sh

#!/bin/bash
# adds an A record and a PTR for the passed fqdn/ip pair

function printUsage () {
    echo "usage: $0 fqdn ip"
    echo
}

if [ $# -ne 2 ] ; then
    printUsage
    exit 1
fi

cli53="/usr/local/bin/cli53"

if [ ! -x $CLI53 ] ; then
    echo "cli53 not installed."
    echo "google is your friend."
    exit 1
fi

fqdn=$1
ip=$2

hostname=`expr "$fqdn" : '\([^.][^.]*\)\..*'`
domain=`expr "$fqdn" : '[^.][^.]*\.\(.*\)'`

echo "Hostname: $hostname"
echo "Domain: $domain"

IFS=. read ip1 ip2 ip3 ip4 <<< "$ip"

echo "IP: $ip1 $ip2 $ip3 $ip4"

ptrdomain="$ip3.$ip2.$ip1.in-addr.arpa."

echo "Creating A record"
$cli53 rrcreate --wait -x 300 $domain $hostname A $ip
echo "Creating PTR"
$cli53 rrcreate --wait -x 300 $ptrdomain $ip4 PTR $fqdn.