#!/bin/bash
 
 
DOMAIN="tudominio.com"
USER="usuario"
PASS="clave"
VER="0.1"
 
IP=$(curl -s http://myip.dk/ | egrep -m1 -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')
 
 
if [ -r "/tmp/oldip.txt" ]; then
  OLDIP=`cat /tmp/oldip.txt`
  if [ "$OLDIP" = "$IP" ]; then exit 0; fi
fi
 
echo $IP > /tmp/oldip.txt
 
wget -q --http-user="${USER}" --http-password="${PASS}"  "http://dyn.everydns.net/index.php?ver=${VER}&ip=${IP}&domain=${DOMAIN}" -O -