Did you know single and double quote strings result in different outputs with environment variables? We didn’t before writing the ultimate guide for environment variables in Linux and Mac.
https://doppler.com/blog/how-to-set-environment-variables-in-linux-and-mac
Hello @ryan-blunden
I do not know much more, but I know the single quote saves the original value of each character, and the double quote saves the different extension and meaning of a special character.
Thanks for sharing 
this useful insights Ultimate Guide to Managing Mac and Linux Environment Variables in Bash
