I've been writing shell scripts in PHP for more than 20 years for this reason. Don't work on a lot of PHP sites any more but I still do most of my shell scripting in it. I think this'll be a big win for C# users once they get used to the paradigm shift.

I notice another poster said it's a bit slow but for many common use cases even half a second startup time is probably a small price to pay to be able to write in the language you're familiar with, use your standard libraries, etc.