External IP logger (Bash script)

Synopsis

A Bash script that checks and saves computer's external IP (assigned by ISP).

Scenario

We want to log our external IP to a file and each time we run the script it checks if there is a change : if the IP changed, it updates the file, else the log stays the same.

Prerequisites

• Lynx sudo apt-get install lynx

Usage

Make the script executable (sudo chmod +x ext_ip.sh) and then run it.

Notes

While writing this script, i encountered this issue : Everything was working well if i was using nano or the internal editor of Midnight Commander to write the .sh file, in Linux environment.
But when i was trying to run the script that was written in Windows environment, nothing was working !
After some research, i found out that the problem might be that the editor i used in Windows, was addinf \r (carriage return) at the end of every line and it was messing with my script.
So : Choose your editor wise ! (or be careful when exchanging code between Linux <---> Windows)