Prints you external IP address on the screen

myip.sh

#!/bin/bash

# Filename: myip.sh
# Synopsis: Access whatsmyip.com servers and prints you external IP address
#           on the screen
# Author: Rafael Oliveira <ludug3r0@gmail.com>
# License: Fell free to use, copy, modify, distribute, etc

# Note: Do a favor to the whatsmyip.com guys and do not over use
#       their network. Try to wait 300 seconds to use this program a second 
#       time. If you are having consistent errors running this program, 
#       check http://www.whatismyip.com/faq/automation.asp and try to change
#       the address below with a new one
MYIP_AUTOMATION_URL="http://automation.whatismyip.com/n09230945.asp"

# Getting file with your IP address
RESPONSE=`wget --quiet -O - ${MYIP_AUTOMATION_URL}`

# Checking if the file was correctly downloaded
if [ $? -eq 0 ]; then # correctly downloaded
	echo ${RESPONSE}
else
	echo "Error detecting your IP address. Try again later."
fi