Re: How to unset environment variable

[Derek Rhodes]

Hi Sam, I dug around in the source and found this function:

(delete-environment-variable! "FOOBAR").  

It was located in os-primitives.scm:

https://git.savannah.gnu.org/cgit/mit-scheme.git/tree/src/runtime/os-primitives.scm?h=release-11.2

I couldn't find docs for it, but there is a comment in the implementation that might be worth reading. Hope that helps!

On Sun, May 1, 2022 at 4:52 AM Sam Lee <samlee746@yahoo.com> wrote:

I found that it is possible to unset an environment variable by setting
it to #f. For example, (set-environment-variable! "FOOBAR" #f) unsets
the environment variable named "FOOBAR". However, this doesn't seem to
be documented anywhere in the user manual or reference. Is this the way
to unset an environment variable in MIT Scheme?

I am running MIT Scheme 11.2.