TrueNas Scale ist tatsächlich Linux, woran du mit BSD denkst ist TrueNas Core

Klingt so als solltest du in deinem Beispiel nicht die man pages, sondern help benutzen, also in deinem Beispiel ls --help. Ich kann auch tldr sehr empfehlen

You could try Ondsel, the trimmed UI makes it easier to use than Freecad in my opinion, the learning curve is still steep tho. No account needed if you get it on GitHub: https://github.com/Ondsel-Development/FreeCAD/releases

You could also take a look at Plasticity, seems very intuitive to use and should work well with your clicky workflow, it’s a one time payment and has a Linux version. I don’t have any personal experience with it, but there is a trial version so you can try it before investing any money. https://www.plasticity.xyz

You can download Ondsel ES directly from GitHub, no account needed: https://github.com/Ondsel-Development/FreeCAD/releases