Shell/bash

[rhss6-2011]

Ok, so Shell or Bash? All the scripts I've been using (based on what I was taught through a couple of books) told me to "ALWAYS" use that beginning. What's the difference?

And aside from that, I'm still not exactly wrong with the script. It worked just fine about two or three years ago... I install updates and it's not working? I'm not sure what exactly the problem is to begin with; I don't know what the right question is for that matter!

Edited to add this:

And even using "bash extract.sh" in my terminal the end result is still the same, regardless...