That's a great question!
Normally, you don't explicitly set the PWD environment variable yourself. It's automatically managed and updated by your shell (like bash or zsh) every time you change your current directory using commands like cd.
The shell keeps track of your location and ensures PWD always reflects where you are in the file system.
If you were to try and set it manually, for example:
PWD=/etc/...it would only temporarily change the variable's value in the current shell session, but your actual working directory wouldn't change. When you then run cd to another directory, the shell would overwrite your manual setting with the correct path.
So, the short answer is: you change your PWD by changing your directory with the cd command!
Does that make sense? Let me know if anything is unclear!
