I meant the modules that were talked about in the parent comment. Not as a predecessor to scsh. The Perl module I referenced isn't to use Perl as a shell and

I meant the modules that were talked about in the parent comment. Not as a predecessor to scsh. The Perl module I referenced isn't to use Perl as a shell and neither are the modules mentioned by heavenlyhash. They instead allow one to use system commands as if they were previously declared functions. While scsh and clash both do this to allow you to use it as an interactive shell they do not extend the parent language (as far as I can see) to be used like a shell scripting replacement. Emacs is a slightly different case as im not sure where the line between elisp and emacs should be drawn. If yiliu look at the modules in the other comments you'll see they all have roughly the same interface as the Perl module from 1994, before many of the languages, python, go, java existed or were really used by then.