In an effort to learn more about using the command line on my MacBook, I downloaded and installed the "friendly interactive shell", also know as fish (http://fishshell.com/
I followed the instructions in the following link:
The last step in the above link is:
"Make fish the default shell. Append opt/local/bin/fish to the /etc/shells file. Then open the Accounts System Preferences panel, unlock it, Control-click on your account picture and select Advanced Options. Set the Login Shell to opt/local/bin/fish."
However, it's not working. When I try to run Terminal, I'm getting the following error message:
"You are not authorized to run this application. The administrator has set your shell to an illegal value."
How can I fix this?