> Shell is a command-line interpreter with additional functionality like scripting. Why it should have fully functional REPL? Lisp/ST/etc are programming langua

> Shell is a command-line interpreter with additional functionality like scripting. Why it should have fully functional REPL? Lisp/ST/etc are programming languages, they are uncomfortable for copying files, moving directories, calling curl or using tar. Lisp is an interactive programming language. On can run functions like COPY-FILE, RENAME-FILE, ... The Listener of the Symbolics Lisp Machine has commands which allow prompting of arguments, input menus, completion, object reuse, etc. It's also integrated in Lisp. For example you can list a directory using a command and then use the pathname objects in calls to Lisp functions. One can also use the output of Lisp functions as input to commands. It's an interesting mix of a command interpreter and a Lisp REPL.