Just like undo and redo, you can make use of :earlier command to undo changes, and :later to redo changes. Revert changes using :earlier or :later commands: Open a file using vi command, example: vi sampleFile.txt.Open Terminal on your macOS/Linux (or Bash Shell if you are working on Windows 10).Note that there is a difference between the capital letter U (Shift + U) and the lower case letter 'u', Example: :2u or uu in vim will undo 2 previous changes, :3u will undo 3 changes. If you want to undo multiple steps you can try syntax :u where n -> number of steps you want to undo. You can also add a number to the redo command example: To redo the last two changes you can use 2Ctrl+R.You can also use the long-form i.e :undo, but as :u is shorter so is more preferred.Now type Ctrl+R (press and hold Ctrl and then R key) to redo the last changes.Make sure you are not in INSERT mode, press Esc key to goto COMMAND mode,.You can also use the long-form i.e: undo, but as :u is shorter so is more preferred.Now type :u (colon and u) to undo the last changes.If you are in INSERT mode, press the Escape - Esc key to get back to the COMMAND mode,.vi keeps a track of all the last changes you make.

You can also apply the changes again (redo) or get back to the text before the changes you made. You can use the undo command to revert the text to how it was before each change. vi is pre-installed on nearly all UNIX flavors (includes macOS and centOS), you have to have a good hold of keyboard shortcuts and commands if you want to work with it, yes may seem old-school if you are new to the programming environment, but it is very popular among software engineers. Vi is by far the most popular console-based Text Editor for UNIX/Linux Operating Systems.

Undo command mac keyboard