How do you exit the vi command in Linux?

In vi command mode, you can exit by using the following method:

1. Press the Esc key, enter command mode, then type :q and press Enter to exit.
2. If you have made any changes to the document, you can type :wq and press enter to save and exit.
3. If you have made changes to the file but do not want to save them, you can input :q! and press Enter to force exit.
4. If you accidentally enter vi command mode, you can type :q and press enter key to exit.

Please note that the above commands should be executed in command mode, not in insert mode. If keys are unresponsive, it may be because you are currently in insert mode. Press the Esc key to return to command mode before executing the exit command.