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I have been working on learning lisp for about a month now and am working writing my first program on my own. For this project I decided I wanted to rewrite a shell script I use often called cnotes as this project is mainly just working with the basics of the language. The issue I am facing is with writing a function to get shell environment variables. In C I did this using the getenv function and in shell this is rather simple, lisp however seems more difficult in that this has not been standardized within common lisp. I did some research and found this post which gives a function to get environment variables. Being new to lisp I don't fully understand everything this does, but from what I can gather reading the code and the documentation it works like this: