What's a unique customization on your Linux machine you think no one else has?
Just wondering since I know a lot of people quietly use a screen-area-select -> tesseract OCR -> clipboard shortcut.
I separate subjects of interest into different Firefox windows, in different workspaces -- so I have an extension title them and a startup script parse text to ask the compositor to put them in the correct workspace (lets me restart more conveniently).
I have automatically-set different-orientation wallpapers for using my 2-in-1 depending on whether I use it in portrait or landscape (kind of just for looks, but I don't think if anyone else adds a wallpaper change to their screen rotation keybind).
I suspect my habit of having an alias userctl="systemctl --user" is slightly unusual, as is running Firefox, Steam, and some other graphical programs as systemd units is somewhat unusual (e.g. mod4-enter runs systemd-run --user alacritty)
But what I'm actually pretty sure is unique is my keyboard layout. I taught myself dvorak a summer some decades ago, but the norwegian dvorak layout has some annoyances, so I've made some tweaks. Used to be a Xmodmap file, but with the switch to wayland I turned it into a file in /usr/share/X11/xkb/symbols/.
Part of what I did to teach myself dvorak and touch-typing at the same time was randomize the placement of the keycaps too. It has a side effect of being a kind of security by obscurity layer: I type quickly and confidently, but others who want to use my machines have an "uhh …" reaction.
I didn't know about the systemd-run command. Do you use it to save the command log? I created a script conveniently named x which opens a file in a default app, in the background, so I can still use the terminal. But then I had the problem with handling logs and this sounds like a perfect solution. Gonna try it today.
As for the alias, I wanted to create a pacman-like interface for systemctl, so the commands would be much shorter, but never finished it. For example, sctl -Eun unit would be equal to sysyemctl enable --user --now unit