vi/vim editor FAQ: How do I undo and redo changes in the vi and vim editor?
Here are a couple of quick examples of how to undo and redo (“re-do”) recent changes in your vi/vim editor sessions.
vim undo (how to undo a change in vi/vim)
You “undo” changes in vi and vim with the undo command, which is the
u key when you are in vim command mode. For instance, if you start with this text in your editor: