I think you've confused iTerm or Terminal.app with "terminal". Cmd-t is an iTerm (and other terminal emulator) shortcut for opening a new tab. It's not universal, and has nothing to do with the terminal itself, but rather, with the terminal emulator you're using.
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I think you've confused iTerm or Terminal.app with "terminal". Cmd-t is an iTerm (and other terminal emulator) shortcut for opening a new tab. It's not universal, and has nothing to do with the terminal itself, but rather, with the terminal emulator you're using.