How do you run a scheme program in the terminal of Ubuntu?

Question

I have searched and I really can't seem to find this really basic question. I am new to mit-scheme and essentially I want to recreate hello world but instead of doing it through the prompt, I want to have a scheme file that contains the following code:

 (define hello-world
 (lambda ()
     (begin
        (write 'Hello-World)
        (newline)
        (hello-world))))

The problem is I am missing the simplest questions: What is the file extension for a scheme file? How do I run that file through scheme?

I have tried .ss and .scm but every time I try scheme hello-world.scm it says:

;Warning: Invalid keyword: "hello-world.scm"

;Warning: Unhandled command line options: ("hello-world.scm")

Answer 1

Your issue isn't the file extension, it's just that MIT Scheme prints an error if invoked as scheme hello-world.scm, since it's supposed to be invoked as

scheme --load hello-world.scm

Also, note that you are using a left-quote character ‘ rather than the actual quote character '. If you look closely you can see the difference.

Answer 2

Start the scheme interpreter in the same directory as your file. Once you are in the interpreter of mit-scheme, you can always use the following procedure which is built into scheme:

(load "file-name.extension")

This will load the file into scheme. I hope that helped :)

Answer 3

If you are using Visual Studio Code as an editor, you may want to use the "Code Runner extension"
make sure it's installed from the vs code marketplace
then enter Preferences: Open Settings (JSON) and past the following:

"code-runner.executorMap": {
        "scheme": "(exit); racket -i -e '(enter! \"$fileName\")'",
    },

You will be able to run directly your file by clicking the Run Code icon or by pressing Ctrl+Alt+N

NB: putting #lang racket in the top of your file is necessary