How can I undo and redo changes in vi?

Last updated: 07/30/2010

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Using vi, it's very easy to undo any number of changes you have made. Make sure you are not editing (hit Esc), and hit the u. This un-does the last change you made (in edit mode). Repeating the u will continue to backtrack your changes.

If you undo too many times, use cntrl-R will redo the last change you undid. Again you can keep doing over and over.

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How can I undo and redo changes in vi?