What would I be able to do to any Linux clients connected to a fleet-server? I kind of know what osquery does, and how to use it to get information from clients, but can I actually push or do something to Linux clients using fleet?

You can run scripts on hosts if you had scripting enabled when you generated the installer

Ok, but only scripts?

I think so - but haven’t poked around on the Linux side a huge amount. There might also be support for software installers but I’m not sure

Ok, we'll see if anyone else answers as well

@Jacob Burley is correct, you can install .deb and .rpm packages.

If they are present on the client, or if the packaging system is setup correctly?

You upload the package to Fleet and, when you trigger the installation, the package is downloaded: https://fleetdm.com/guides/deploy-software-packages

Really? Cool!

That should be doable using either the install or post-install scripts.

Ok, thanks!