A small script I thought about writing in a dream.

ip.sh

#!/bin/bash

IP=$(curl canihazip.com/s/ 2> /dev/null)
IP_FILE="/tmp/ip.txt "

if [ ! -f $IP_FILE ]
then
  # If $IP_FILE doesn't exist, create one and mail me.
  echo $IP > $IP_FILE
  echo -e "A new /tmp/ip.txt file was created @ cookie.\n\
  Your current IP is $IP" | mail -s "IP report" rberaldo@cabaladada.org
  exit 0
else
  # If it exists, compare to current.
  OLD_IP=$(cat $IP_FILE)
  if [ "$OLD_IP" == "$IP" ]
  then
    exit 0
  else
  echo $IP > $IP_FILE
    echo -e "Your IP has been updated.\n\
    Your current IP is $IP" | mail -s "IP report" rberaldo@cabaladada.org
    exit 0
  fi
fi

I just updated the gist. I now have a Raspberry Pi, so I no longer need to ssh into devio.us to send the email. I'm using sSMTP to send the email but ideally I want to set up a mail server on the RPi.