In Emacs, how to insert file name in shell-command

(define-key minibuffer-local-map
  [f3] (lambda () (interactive)
       (insert (buffer-name (current-buffer-not-mini)))))

(defun current-buffer-not-mini ()
  "Return current-buffer if current buffer is not the *mini-buffer*
  else return buffer before minibuf is activated."
  (if (not (window-minibuffer-p)) (current-buffer)
      (if (eq (get-lru-window) (next-window))
    	  (window-buffer (previous-window)) (window-buffer (next-window)))))

(define-key minibuffer-local-map
  [f3] (lambda () (interactive) (insert (buffer-name))))

(define-key minibuffer-local-map [f3]
  (lambda () (interactive)
     (insert (buffer-name (window-buffer (minibuffer-selected-window))))))

(require 'shell)
(define-key minibuffer-local-map (kbd "C-i") 'comint-dynamic-complete)

(define-key minibuffer-local-map [f3]
  (lambda() (interactive) (insert (buffer-file-name (nth 1 (buffer-list))))))