makes a backup from the previous contents, and arranges to make
another from the newly saved contents if you save again.
+@vindex backup-directory-alist
+ You can customize the variable @code{backup-directory-alist} to
+specify that files matching certain patterns should be backed up in
+specific directories. A typical use is to add an element @code{("."
+. @var{dir})} to make all backups in the directory with absolute name
+@var{dir}. Emacs modifies the backup file names to avoid clashes
+between files with the same names originating in different
+directories. Alternatively, adding, @code{("." . ".~")} would make
+backups in the invisible subdirectory @file{.~} of the original file's
+directory. Emacs creates the directory, if necessary, to make the
+backup.
+
@menu
* Names: Backup Names. How backup files are named.
* Deletion: Backup Deletion. Emacs deletes excess numbered backups.
becomes @code{nil}; if it is @samp{never} or @samp{simple}, then
@code{version-control} becomes @code{never}.
-@vindex backup-directory-alist
- You can customize the variable @code{backup-directory-alist} to
-specify that files matching certain patterns should be backed up in
-specific directories. This variable applies to both single and
-numbered backups. A typical use is to add an element @code{("."
-. @var{dir})} to make all backups in the directory with absolute name
-@var{dir}; Emacs modifies the backup file names to avoid clashes
-between files with the same names originating in different
-directories. Alternatively, adding, @code{("." . ".~")} would make
-backups in the invisible subdirectory @file{.~} of the original file's
-directory. Emacs creates the directory, if necessary, to make the
-backup.
-
@vindex make-backup-file-name-function
If you set the variable @code{make-backup-file-name-function} to
a suitable Lisp function, you can override the usual way Emacs
major mode, you can type @kbd{C-c C-c} (@code{image-toggle-display})
to toggle between displaying the file as an image in the Emacs buffer,
and displaying its underlying text (or raw byte) representation.
+Additionally you can type @kbd{C-c C-x} (@code{image-toggle-hex-display})
+to toggle between displaying the file as an image in the Emacs buffer,
+and displaying it in hex representation.
Displaying the file as an image works only if Emacs is compiled with
support for displaying such images. If the displayed image is wider
or taller than the frame, the usual point motion keys (@kbd{C-f},