Unfortunately not, although my plans are to do so
I guess you are from the Netherlands then, right?
Have you played Uplink? It's a great game that revolves around hacking using components that behave like programs....it is a bit more cyberpunk compared to yours which I believ you want to instill with a detective/'noir' atmosphere. However, I believe that it is a good source of inspiration, at least for the command line thing.
I'd also suggest to take under consideration that not many at least of younger people are anymore familiar with DOS. So, in my opinion you could just adapt the commands to what you want: If you want a 'geeky' feel to it, maybe implement unix commands otherwise maybe just come up with your own, could be a nice idea
Dunno, that's just me.
In a far-fetched scenario this could even evolve into a kind of sandbox world that allows you to wander through a database doing stuff...investigating, solving, exploring...
Once again, nice work!! Oh, and nice twist in the end