[samatman]

> commercial Unix (e.g., Solaris, HP-UX, AIX, etc.) is not as commonplace compared to 20 years ago.

Other than macOS, you mean? It remains a licensed Unix.

I've rarely run into difficulty running FOSS software on macOS, although I've mostly stopped trying with anything with a GUI; not because Linux-oriented GUI programs don't work but because they subvert too many of my expectations, and I prefer to use something Mac-oriented and ideally Mac-native.

Just to confirm that, I downloaded GIMP, it loads fine, scribbled around on a canvas. Went to close it and it popped up one of those dialogue boxes telling me to either save the file or lose my work. I've grown rather accustomed to programs just behaving correctly, which is to close down, and open up again exactly as I left them. But it does seem quite functional in the usual sense.

There are some tools which are entirely Linux specific, rr comes to mind.