How to Get Better Diff Support at the Command Line From Github

In this day and age of code signing how can i verify the signature of the app to make sure that it is what it is? There's a code sign tool that from the command line you can verify the the signing signature of the application. You can change the configuration of the pager for that so that the diff highlight will actually highlight from the commandline output the actual portion of that line that changed instead of just showing you the whole line. The one thing that i took issue with in an article on how to get better diff support at the command line from git was the way he copied the diff highlight into your low user local bin path. I didn't have time to update my environment