How to save changes in vi?

To save changes in vi (or vim), follow these steps:

1. Press Esc: This ensures you are in command mode.
2. Type :w and press Enter: This command will save the changes you have made to the file.

If you want to save the changes and exit vi at the same time, you can use:

• Type :wq and press Enter: This will save the changes and then quit the editor.

If you want to save the changes under a different filename, you can use:

• Type :w newfilename and press Enter: Replace newfilename with the desired name for the file.

Remember to press Esc before typing the colon (:) to enter command mode.