What is an interactive shell?

[scarymovie]

What is it? How do I remove a user's rights from accessing the interactive shell?

[rcgreen]

An interactive shell is whenever you are working at the command
line. A non interactive shell is invoked to run a script.

I'm not sure how you keep a user from using an interactive shell.
If you have some special limited session you want to put the user
into, you could assign some other program to be the shell.

Say you wanted the user to only be able to run solitaire, then you
configure solitaire to be that user's shell. He can't exit to the command
line. If he exits the program, he is logging out.