It wouldn't necessarily - it just has to be 100% transparent. A simple alias would probably break a lot of scripts, but if you were very thorough or provided an entirely separate tool for users - that's what I'm suggesting would do this. In reality, I was really just thinking allowed - I think rm's fine as it is. To do this while overcoming the shortcomings I mentioned in DOS's simple approach requires a system more complex than the original problem is worth, IMO.