#!/bin/bash

#
# external-ip.sh
#

# Quick script to scrape the external IP address

# Variables
PATH=/usr/bin:/bin
logfile=/home/username/.ip_log
url="http://ipecho.net/plain"
old_ip=""
current_ip=""
[email protected]

if [ ! -e $logfile ]; then
  touch $logfile
fi

if [ -e $logfile ]; then
  if [ -s $logfile ]; then
    old_ip=$(cat $logfile)
    current_ip=$(curl -s $url)
    if [ $old_ip = $current_ip ]; then
      exit 0;
    else
      echo $current_ip > $logfile
      echo 'New IP address for' `hostname -f` 'is:' $current_ip 'on' `date` | mail -s 'New IP' $email
    fi
  else
    current_ip=$(curl -s $url)
    echo $current_ip > $logfile
  fi
fi