[SixSigma]

And then someone wraps it in a CLI interface.

What you need is a kernel that exposes programs as a file system like plan9

[RandomOpinion]

>What you need is a kernel that exposes programs as a file system like plan9

Powershell?

[pjmlp]

That is what the REPL like on Lisp Machines, Interlisp-D, Smalltalk, Mesa/Cedar, Oberon is for.