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8.4 Undoing Changes

Emacs records a list of changes made in the buffer text, so you can you can undo recent changes, as far as the records go. Usually each editing command makes a separate entry in the undo records, but sometimes an entry covers just part of a command, and very simple commands may be grouped.

C-x u

Undo one entry of the undo records—usually, one command worth (undo).


The same.

The command C-x u (or C-_ or C-/) is how you undo. Normally this command undoes the last change, and moves point back to where it was before the change.

If you repeat C-x u (or its aliases), each repetition undoes another, earlier change, back to the limit of the undo information available. If all recorded changes have already been undone, the undo command displays an error message and does nothing.

The undo command applies only to changes in the buffer; you can't use it to undo mere cursor motion. However, some cursor motion commands set the mark, so if you use these commands from time to time, you can move back to the neighborhoods you have moved through by popping the mark ring (see section The Mark Ring).

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