Why does `whoami` give a different answer than Current User in Users & Groups? I don't recall exactly what info I was asked to provide at the time I set the mac up, which is leading to some confusion.

On my mac, when I run whoami in a terminal, it tells me aerovistae, my general username. However, if I open Users &amp; Groups, it tells me the current user is myFirstName myLastName.

Why is this? Is it the same account, and it has two different name properties? What is the difference?
It is the same account. The name displayed in Users &amp; Groups is your full name, the one shown by whomami is the name of the account as known to the underlying Unix system (and also used as the folder name for your home folder). To check yourself, open Users &amp; Groups, unlock if necessary and then right-click on your user name in the left column. This will show you the technical details behind your account.