How to generate a list of daily changes to my notes?

**Background**: I use Obsidian to organize my notes as I study. It's an application which works "on top of" a collection of markdown formatted plain text files and then shows the links and connections between them graphically. The text files I stored within sub folders of a single folder **What I want:** Since I am studying for an upcoming exam, I add information to several of these text files each day. At the end of the day, I'd like to have an automatically generated single text file containing all the changes I made to each of my files. A kind of "daily digest" which I can then read through to revise everything I learned on that day. **Additional background:** I already have a cron job set up to use rsync to make an uncompressed copy of my notes folder every day at 3:00 AM. I assume this copy can act as a reference when I want to see what modifications have been made at the end of the current day. **An example** Let's say on the 15th of May, I made the following changes Added "This is some new text" to file A Added - "this is some more textual information" to file B. My "daily digest" at the end of the 15th of May would read "This is some new text" This is some more textual information" **My Research:** I understand that tools like diff and meld (GUI) are great for comparing files. The diff output formatting it a quite difficult to understand. Meld on the other hand is very easy to use but it's a GUI app so I can't figure out how to direct it's output to a single text file.