The actual description is here isn't 100% clear, but I didn't want to post my own article just for the sake of clarifying as it felt a bit like stealing!
The instructions you need are at the bottom of the post – "solution 4". Put the AppleScript into a new file, /usr/local/bin/notifyme (or wherever on your path) and then add the function to your .zshrc (changing "notifyme" if you named the AppleScript something different). This will then take effect for any new Terminal windows.
The instructions you need are at the bottom of the post – "solution 4". Put the AppleScript into a new file, /usr/local/bin/notifyme (or wherever on your path) and then add the function to your .zshrc (changing "notifyme" if you named the AppleScript something different). This will then take effect for any new Terminal windows.