Emacs: Convenient Command to zip File in dired

(defun 2zip ()
  "Zip the current file/dir in `dired'.
If multiple files are marked, only zip the first one.
Require unix zip commandline tool."
  (interactive)
  (require 'dired)
  (let ( (fileName (elt (dired-get-marked-files) 0))  )
    (shell-command (format "zip -r '%s.zip' '%s'" (file-relative-name fileName) (file-relative-name fileName)))
    ))

See also: Emacs: Convert Image Files in Dired.

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