How can I get rid off Last login: message on terminal?

That shouldn't happen. I think you should download & run the free version of MalwareBytes to see if you have "shopping & shipping assistents" on board, shivering-ya-timbers.

Malwarebytes

If terminal only appears after starting up your Mac, also check System Preferences > Users & Groups "Your account" > tab: Login Items if there are any startup apps that you know nothing about ever putting there.

That message is totally normal for when Terminal opens. If your Terminal is opening by itself (it's not, something is calling it) then you have to find out what is calling Terminal to open.

But that message is just telling you when you last logged into your Terminal. The ttys000 part is just the terminal window session number. If you opened a new Terminal window whilst leaving that first open it would say ttys001. You cannot get rid of this message. It's how Terminal works and has always worked.

Find out what program or routine is calling Terminal. The Logic AU Eval Tool will call Terminal.

ps this is the forum for the audio recording software Logic.

I also have this problem, Terminal just opens by itself, only over the past year!

Now I just ignore it, or turn it off when it appears.

Erik is right. Terminal doesn't open by itself. Something calls it and you need to find out what is calling it.

Thank you Octopi & Eriksimon

I have used Malwarebytes but the terminal still pops up from time to time.