Get external IP address and write to file if it has changed

Get external IP, write to file

#!/bin/bash

# Where should this file be stored?
ipfile=~/Desktop/external-ip.txt

# Go ahead now, go ahead and get that IP
IP=$(curl -s http://icanhazip.com)

# Has the address changed? If it has go ahead and write that bad boy down. If not, no worries.
OLDIP=""
if [ -f "$ipfile" ]; then
   OLDIP=$(<$ipfile)
fi

# Write the new IP to that file we mentioned earlier.
echo $IP > $ipfile