

From what I understand, on Debian and therefore presumably also Devuan, the system-wide default shell is dash. So, sh symlinks to dash.
But dash is virtually unusable for interactive use, so they configure the terminal emulator to launch bash on start-up.
In effect, scripts get executed with dash by default, but commands you type into a terminal get run by bash.

















Yeah, basically if you want to play Morrowind, at this point you want to do so by using OpenMW. You do need to own the original game, but OpenMW makes it much easier to run on modern operating systems and has lots of quality-of-life improvements, like higher resolution, higher viewing distance, as well as most loading times eliminated.