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To add a class path permanently to the Mac terminal, you can follow the steps below:

1. Open the terminal on your Mac.
2. Navigate to your home directory by typing the command cd ~.
3. Create a new file called .bash_profile by typing the command touch .bash_profile.
4. Open the .bash_profile file in a text editor by typing the command open -e .bash_profile.

5. In the text editor, add the following line of code to set the class path:

   export CLASSPATH=/path/to/class/folder:$CLASSPATH

   Replace /path/to/class/folder with the actual path of your class folder.

6. Save and close the file.

7. To apply the changes, either restart the terminal or type the command source ~/.bash_profile.

Now, your class path should be permanently set in the Mac terminal, and you can use the classes in your specified folder from anywhere in the terminal.