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Chapter 5. Using the vi Editor > Undo and Redo
5 6. Undo and Redo
If you make a change by mistake, you can always undo that change. You use the u command to undo the last change. You can also use the U command to undo all changes made to the current line. To redo something changed by undo, you can use the “.” (dot) command. Undo and redo are opposite to each other.
