How do I complete file paths in emacs?

I usually type Ctrl-X Ctrl-F like I would open a file, but instead of pressing RET I press Ctrl-A Ctrl-K Ctrl-G to copy the path and then paste it into the buffer I was editing with Ctrl-Y.

I don't need this often enough, but if I really wanted a better solution, I would definitely use Trey Jackson's solution using hippie-expand. I thought about how hippie-expand might be a better way to do this when first answering, but I didn't know and was too lazy to look it up, so I just wrote what I do.

Try Hippie Expand, which as one of it's possibilities has 'try-complete-file-name. You can change the order and list of expansion functions hippie expand will use to favor expanding the file name.

Or, you could even write a custom wrapper that would only do the file name expansion. Something like:

(global-set-key (kbd "C-M-/") 'my-expand-file-name-at-point)
(defun my-expand-file-name-at-point ()
  "Use hippie-expand to expand the filename"
  (interactive)
  (let ((hippie-expand-try-functions-list '(try-complete-file-name-partially try-complete-file-name)))
    (call-interactively 'hippie-expand)))

Up to version 25, the vanilla, out-of-the-box

M-x comint-dynamic-complete-filename

and

M-x comint-replace-by-expanded-filename

both worked outside of comint mode. Of course, you can use the minibuffer's dynamic expansion to use less keystrokes to get to them (e.g., M-x comint-dynamic-complete-filename or M-x comint-replace-by-expanded-filename). Or, if you will be doing this frequently, you can bind them to key sequences of your choice using global-set-key .

For version 26+, it seems to me that you need to make sure that comint mode is explicitly loaded --- adding a line

(require 'comint)

in your .emacs file should make this work again.

Caveat: Not all applicable comint functions can be used this way. comint-dynamic-list-filename-completions doesn't seem to work outside of its native mode.