homemade dyndns

gistfile1.sh

#!/bin/bash
# this one mails you the ip if it changes

T1=`curl -s icanhazip.com`

touch old_ip.dat
read T2 < old_ip.dat

if [ "$T1" = "$T2" ]; then
    echo "`date` -- ipchange script -- IP is the same: $T1 - doing nothing " | tee -a /var/log/syslog
else
    (echo "From: FROM@gmail.com"; echo "To: TO@gmail"; echo "Subject: IP Address Update"; echo; echo "Computer's IP Changed. The new IP is:"; echo $T1) | sendmail -f FROM@gmail.com TO@gmail.com
fi

echo $T1 > old_ip.dat