It looks like you hosed your bash profile or bashrc
Open up the Preferences menu option.
Click on the Startup Tab
Move the radio button to "Command (complete path)"
Put
"/bin/zsh"
Without the quotes in the box. Close the preferences and hit Apple-N to open a new Terminal window. If this works, type (These files may or may not exist):
rm ~/.bashrc
rm ~/.bash_profile
Then you can probably change the Preference back (assuming you didn't hose the system-wide one)
Open up the Preferences menu option.
Click on the Startup Tab
Move the radio button to "Command (complete path)"
Put
"/bin/zsh"
Without the quotes in the box. Close the preferences and hit Apple-N to open a new Terminal window. If this works, type (These files may or may not exist):
rm ~/.bashrc
rm ~/.bash_profile
Then you can probably change the Preference back (assuming you didn't hose the system-wide one)