Apple - Broken terminal
Are you running zsh? I'm seeing a similar problem while running iTerm2. It seems to be a problem with zsh and not with Terminal or iTerm2. Just started happening to me.
If you had installed zsh with Homebrew and you are having that problem, what worked for me was:
brew reinstall zsh && brew unlink zsh && brew link zsh
If you didn't install zsh with Homebrew, then ignore this :-)
Choose Shell → New Command….
chsh -s /bin/bashand make sure to deselect ‘Run command inside a shell’.
Enter your user account password at the prompt to change your shell back to /bin/bash.
Easier I think:
Download iTerm2 and
brew update && brew upgrade zsh worked for me ;-)