How to save and exit a file in Linux after editing it.

After editing a file in Linux, you can use the following command to save and exit the editor:

1. If you are using the Vi or Vim editor:
2. Press the Esc key to make sure you are in command mode.
3. Enter a colon (:) and then type wq, followed by pressing the Enter key. This will save the file and exit the editor.
4. If you are using the Nano editor:
5. Press Ctrl + O to save the file.
6. Press Ctrl key and X key at the same time to exit the editor.
7. If you are using the Emacs editor:
8. Press Ctrl + X to cut and then press Ctrl + S to save the file.
9. To close the editor, press Ctrl key and X, then press Ctrl key and C.

Please choose the appropriate command to save and exit based on the editor you are using.