Trying to find files on a system that contain a certain string

I have tried just about every find and grep command possible and I cannot find these damn files!!

This is the problem:

On the node you just swapped in, there are 5 JPEG files whose names contain the word "intro" in some form. Find all five files from on the entire disk (i.e. from root /).

Please someone explain how to do this!!!!

Is this a homework assignment? If it is, please close this thread and open a new thread in the Homework & Coursework Questions forum completely filling in the questionnaire in the template in the following: Rules for Homework & Coursework Questions Forum.

If this isn't homework, please explain where these five files came from and show us what find and grep commands you have tried.

And, explain what you mean by swapping in a node.

And, it is always a good idea to tell us what operating system and shell you're using.

yes it was a HW assignment, but I figured it out.
Also just after posting this I saw the HW section in the forums. Sorry

Thank you