Shell Emacs key binding

[balanga]

I'm trying bind the emacs dired mode command dired-up-directory to the left key using:

(define-key dired-mode-map (kbd "<left>") #'dired-up-directory)

I get this error:-

Symbol's value as variable is void: dired-mode-map

Any ideas?

 

[Charlie_]

(load "dired")
(define-key dired-mode-map (kbd "<left>") #'dired-up-directory)

or

(add-hook 'dired-mode-hook
        (lambda ()
          (define-key dired-mode-map (kbd "<left>") #'dired-up-directory)))