Domain IP Watcher

ipwatcher.sh

#!/bin/sh

if [ $# -lt 1 ]; then
  echo "USAGE: $0 [domain.com]"
  exit 1
fi

DOMAIN=$1
INITIAL=$(dig $DOMAIN | grep -E 'IN.+A.+.+' | awk '{print $5}')
echo "Initial IP = $INITIAL"

while [ "$INITIAL" == "$(dig $DOMAIN | grep -E 'IN.+A.+.+' | awk '{print $5}')" ]
do
  sleep 5
done

osascript -e 'tell app "System Events" to display dialog "The domains IP has changed" buttons {"OK"} default button 1 with title "IP Changed" with icon caution'