Handy way to use su in Mac Terminal
I don’t recall where I came across this information but passing it along should others need it or for myself to refer back to. I had tried in the past to us the Linux su command to login as a super user but it never worked. I think there are barriers built into to prevent this action.
What you can do to get around that behavior is to use the sudo command.
This will provide you access to the superuser without having to type in sudo every time if you have a number of commands.