update w01 notes

content/w/01.md

@@ -93,3 +93,34 @@ https://comp426-2022-spring.github.io/slides/w01-01.html
 [JavaScript Variables – A Beginner's Guide to var, const, and let](https://www.freecodecamp.org/news/javascript-variables-beginners-guide/) - Madison Kenna
 
 [Arrow functions for beginners](https://codeburst.io/javascript-arrow-functions-for-beginners-926947fc0cdc) - Brandon Morelli
+
+### Notes
+
+In class today, I was trying to set environment variables so that we could see what happened when we used one instead of letting the basic webserver use its default, but `setenv` wasn't working. 
+
+This is because `setenv` doesn't belong to `bash`. 
+It belongs to a different shell. 
+I was recently working on a system using `tcsh` instead of `bash` and those commands got stuck in my head.
+
+The correct commands for setting (and viewing) an environment variable called PORT are below:
+
+```bash
+# `export` will set an environment varialble
+export PORT=5000
+
+# If set, the following should give you the value saved in the variable:
+echo $PORT
+
+# To see an environmental variable you can call `env` and pipe it through `grep`
+env | grep PORT
+
+# `env` without any options will put ALL environment variables into STDOUT.
+env
+
+# `env` will set a variable similarly to `export` above and then put all environment variables into STDOUT
+env PORT=5000
+
+# You can un-set a variable with `env` as well
+env -u PORT
+env --unset PORT
+```