#!/bin/bash
# script to test for changing ip
# loop de loop
you=YOU@YOUR_EMAIL.ADR
saved=""
while [ 0 ]
do
    addy="$(/sbin/ifconfig | grep 'inet addr' | awk '{print $2}' | sed 's/addr://g')"
    if [ ! "${addy}" == "${saved}" ]
    then
        echo ${addy} | mailto -s ippy ${you}
        saved=${addy}
        echo "mail sent"
    fi
    sleep 30m
done