Howto get a list of network interfaces in Linux, part 1

Hi folks,

Today we are going to become a little bit more technical. Some of you might wonder how to get a list of the network interfaces. For our first part, we are going to consider the shell script case.

Little disclaimer first, I am not an expert at shell-scripts at all, my abilities are limited to understanding the random scripts I encounter during my daily use of Linux on my computers, and writing the occasional script that saves some time when having to automate some boring tasks (converting a few gigs of  videos is boring).