Check for double domain

check_double_domain.sh

#!/bin/bash
# (C) 2012, Kameron Kenny
# ExactTarget

nl(){
  echo ""
}

print_help(){
  nl
  echo "Usage: $0 -n x.x.x -d domain.local"
  nl
  echo "Arguments: "
  echo "  -n | --net) x.x.x - First three octets of network address"
  echo "  -d | --domain) domain.local - will be turned into domain.local.domain.local"
  nl
}

if [[ -z "$1" ]]; then
  print_help
  exit 1;
fi

while [[ -n "$1" ]]
do
  case "$1" in
    -h)	    print_help; exit 0;;
    --help)   print_help; exit 0;;
    -n)	    network=$2; shift;;
    --net)    network=$2; shift;;
    -d)	    d=${2}.${2}; shift;;
    --domain) d=${2}.${2}; shift;;
    *)	    print_help; exit 0;;
  esac
shift
done

if [[ -z "$d" ]]; then
  echo "ERROR: You need to set a domain to be checked..."
  print_help
  exit 1;
fi

if [[ -z "$network" ]]; then
  echo "ERROR: You need to set a network to check..."
  print_help
  exit 1;
fi

for i in {1..254}; do
  ip=${network}.${i};
  cmd=$(nslookup ${ip} | grep "${d}")
  if [[ -n "$cmd" ]]; then
    echo "${ip}"
    echo "----------------"
    nslookup ${ip}
    echo ""
  fi
done