... download software from the internet and run it?
Does it have to be a shell script? AppImage and Flatpak, like, don't seem to be natively recognized no matter what distribution I go to and I always need some third party garbage.

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... download software from the internet and run it?
Does it have to be a shell script? AppImage and Flatpak, like, don't seem to be natively recognized no matter what distribution I go to and I always need some third party garbage.
On fedora and I think other distros, flatpak is part of the software store apps. I believe there's also apps that turn app images into desktop shortcuts so they behave like normal apps
universal blue and the other ostree based fedora derived (micro) distributions try to leverage flatpak as much as they can.
I think you used to be able directly install .deb packages on Ubuntu but that was too convenient so it got removed.
appimages are just directly executable, I think. Or at least that’s how they’re designed to be, and I’ve done that in the past.
There's the extra step of going to properties and checking the box to allow it to execute, but otherwise this has been my experience so far.
for appimage you just set them to executable and run them
for flatpak, a lot of package managers have either an option you can set, or a plugin module you can install that lets the package manager manage them
otherwise, you can just install things from GitHub and then use topgrade to update all of them (and everything else) without having to remember everything you've installed from git