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Reverting a Buffer
If you have made extensive changes to a file and then change your
mind about them, you can get rid of all changes by reading in the
previous version of the file. To do this, use `M-x revert-buffer',
which operates on the current buffer. Since reverting a buffer can
result in very extensive changes, you must confirm it with `yes'.
If the current buffer has been auto-saved more recently than it has
been saved explicitly, `revert-buffer' offers to read the auto save file
instead of the visited file (Note: Auto Save.). Emacs asks you about
the auto-save file before the request for confirmation of the
`revert-buffer' operation, and demands `y' or `n' as an answer. If you
have started to type `yes' for confirmation without realizing that the
auto-save question was going to be asked, the `y' will answer that
question, but the `es' will not be valid confirmation. This gives you
a chance to cancel the operation with `C-g' and try again with the
answers you really intend.
`revert-buffer' keeps point at the same distance (measured in
characters) from the beginning of the file. If the file was edited only
slightly, you will be at approximately the same piece of text after
reverting as before. If you have made more extensive changes, the
value of point in the old file may bring you to a totally different
piece of text than your last editing point.
A buffer reverted from its visited file is marked "not modified"
until you make a change.
Some kinds of buffers whose contents reflect data bases other than
files, such as Dired buffers, can also be reverted. For them,
reverting means recalculating their contents from the appropriate data.
Buffers created randomly with `C-x b' cannot be reverted;
`revert-buffer' reports an error when asked to do so.
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