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In order to have dired-jump and dired-jump-other-window
(see Miscellaneous Commands) work before dired and
dired-x have been properly loaded the user should set-up an autoload
for these functions. In your .emacs file put
;; Autoload `dired-jump' and `dired-jump-other-window'.
;; We autoload from FILE dired.el. This will then load dired-x.el
;; and hence define `dired-jump' and `dired-jump-other-window'.
(define-key global-map "\C-x\C-j" 'dired-jump)
(define-key global-map "\C-x4\C-j" 'dired-jump-other-window)
(autoload (quote dired-jump) "dired" "\
Jump to Dired buffer corresponding to current buffer.
If in a file, Dired the current directory and move to file's line.
If in Dired already, pop up a level and goto old directory's line.
In case the proper Dired file line cannot be found, refresh the Dired
buffer and try again." t nil)
(autoload (quote dired-jump-other-window) "dired" "\
Like \\[dired-jump] (dired-jump) but in other window." t nil)
Note that in recent releases of GNU Emacs 19 (i.e., 19.25 or later) the file
../lisp/loaddefs.el of the Emacs distribution already contains the
proper auto-loading for dired-jump so you need only put
(define-key global-map "\C-x\C-j" 'dired-jump)
in your .emacs file in order to have C-x C-j work
before dired is loaded.