Do you mean that they the key press has nothing to do with the key cap, or just that the caps are unrelated specifically to *nix commands and shortcuts?
If you want the key press to send a specific *nix based command then you just program it to do that in QMK and create the keymap to fit your needs. You can even have multiple key maps and swap from one to another if you want a console/terminal specific map.
As for *nix specific key caps, there are not many out there and the sets I linked have some of the ones that could be used for specific tasks if you wanted. They are not perfect but they are better than a dedicated windows or co-pilot key.