After making several mistakes in a vi editor session, which command allows you to quit without saving changes?

The command that allows you to quit the vi editor without saving any changes is indeed :q!. When you encounter numerous mistakes during your editing session and decide not to save your modifications, this command is very useful.

Here's how it works: the colon ‘:’ indicates that you are entering command mode. The ‘q’ stands for quit, and the exclamation mark ‘!’ is a forceful way to exit vi, overriding any potential warnings about unsaved changes. This ensures that you exit the editor without retaining any modifications made during the session.

The other commands serve different purposes. For instance, :wq! would save changes and then quit, which is not what you want in this scenario. The command :q alone attempts to quit but will only work if no changes have been made; if changes exist, vi will not allow you to exit without confirming those changes. Lastly, :exit is another way to indicate a desire to leave, but it requires saving changes if there are unsaved modifications, which again is not suitable for your intent. Thus, :q! is the correct choice for quitting without saving changes.