Thank you for helping HCP.
Ok, I was putting the command in Terminal, not Bitcoin Console without the <>. I went to the console and I got this warning below. Is it safe to import bitcoin-cli importprivkey ? I only ask because I DO NOT fully understand the ramification of a command lol.
https://prnt.sc/glb0m7Welcome to the Bitcoin Core RPC console.
Use up and down arrows to navigate history, and Ctrl-L to clear screen.
Type help for an overview of available commands.
WARNING: Scammers have been active, telling users to type commands here, stealing their wallet contents. Do not use this console without fully understanding the ramification of a command.