[sjatkins]

It isn't lisp but I have used xonsh which is a python shell. It has a lot of nice uses and it is much easier to right python that can interact with normal shell commands well including capturing their outputs than is to write actual bash or whatever scripts. And being able to create these things in a solid repl is very nice.

In general I have dreamed for ages of one language could enough to do everything I want to do with a computer. And I am pretty imaginative as to what is in that set.