There’s a gnome extension (ArcMenu) that’s inspired by Zorin that’s simply a better and more customizable version of all of zorin’s desktop themes (and more). You can get it on any Linux

There’s a bunch of options on github, some of my favorites:

https://github.com/sophieforceno/motd-scripts

https://github.com/HermannBjorgvin/motd

https://github.com/yboetz/motd

You need to use shred instead of rm. If you use rm the data still lives on your drive until it gets overwritten