terminal stuck

Quit Terminal if it is running.

In a Finder window on your Home folder

Command-Shift-Period

This will display all invisible files.

Look for these files and if you find them, rename them

.bash_profile

.bash_login

.profile

.bashrc

Hold the Option key, and go to Finder -> Go -> Library (you need the option key to see the Library entry)

Navigate down to

Library -> Preferences

Find com.apple.Terminal.plist

Drag it out of the Preferences folder

Now try to start Applications -> Utilities -> Terminal

I specified going there, vs just using Spotlight or if you have it on your Dock, or if you have an Alias, because I have seen instances where someone have made a copy of Terminal and is trying to run an old (in some cases VERY OLD) version. The Applications -> Utilities -> Terminal should be the current version.

PS. I happen to like iTerm2, but Terminal should work.

SIDE NOTE: The .bash_profile, .bash_login, .profile, .bashrc would be used by iTerm2, so you may have to put them back after you get Terminal working again, and see if it was the shell initialization scripts or if it was the preferences.

I should mention that iTerm2 will also be using the shell initialization scripts .bash_profile, .bash_login, .profile and/or .bashrc

So when you get Terminal working again, you may have to put the .bash_profile, .bash_login, .profile and/or .bashrc back to figure out if it was one of the shell initialzation scripts or the Terminal preferences that was bad.