#!/bin/bash

HN=`hostname`
TIP=`hostname -i`
RDNS=`nslookup $TIP|grep 'name ='|awk {'print $4'}`
HN2=${HN}.
echo -------------------------
echo Hostname: $HN2
echo IP: $TIP
echo Reverse DNS: $RDNS
echo -------------------------


if [ "$HN2" = "$RDNS" ]; then
  echo Reverse DNS correct
else
  echo Reverse DNS not correct
fi

echo -------------------------