Linux

I think a script with apt/pacman/dnf etc., flatpak update can do the job as well?

IMO its against the unix vision to extend apt to manage flatpak as well.

Fedora updates flatpaks automatically, system updates too, but you need to reboot. Which Fedora version do you use?

I use BAUH as a GUI "update everything in one click" does repos, aur, flatpak, snaps, appimages. Paru is CLI option for repo, aur and flatpak. I dunno if it does snaps never checked.

I use very minimal software and usually don't care about Flatpak

I use one command to upgrade the whole system: paru one one system and yay on the other laptop.

emerge -uDN @world

...and head to bed for me.

Perhaps a small bash script to iterate through all of the package delivery mechanisms' for updating everything?

If you want a single command, consider topgrade. Not sure if it supports Flatpak and Snaps yet, as I do not use those (yet).

It's wild what can be done with some clever aliases. Linux is better now than ever before.

Nah, I don't miss them really, flatpaks are much more convenient and for me fedora kinda just updates itself automatically.

Also, pretty much all graphical app stores on linux support flatpaks and the distro's default package manager, so you can update everything from there...

Snap forces updates, and you cannot disable them. So if you use snaps, I guess you can stop worrying and keep going with your usual apt routine.

I get 99% of my packages via nix and the other 1% through appimages which I can put anywhere I like on my disk

What about pkcon? I haven't used it in particular, but packagekit based GUIs work pretty well in my experience, and then it supports flatpak/snap/apt/kde addons/etc in one interface, which is better than it was originally.

yeah like other people have rec'd, I just wrote a script for installing/removing/upgrading/searching all the package managers I have. this was used as a tongue in cheek jab and has never truly been a brag.