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By M-x eshell or M-x shell Emacs opens a shell or an eshell in the current window. How to open this shell or eshell in a new window?

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  • 1
    The function eshell is only 15 lines of actual code (excluding the doc-string). In my opinion, there is no need to advice or write a fixer function. Instead, just copy the function eshell over the .emacs or init.el file and call it something new -- e.g., eshell-other-window -- change (pop-to-buffer-same-window buf) to (switch-to-buffer-other-window buf). Creating a new function for shell can be done much the same way -- it doesn't really matter that it's a few more lines long, because you will only be changing one line of code and changing the name of the function itself.
    – lawlist
    Jun 30, 2015 at 21:59

3 Answers 3

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Here's a simple command to open a shell in a new window:

(defun shell-other-window ()
  "Open a `shell' in a new window."
  (interactive)
  (let ((buf (shell)))
    (switch-to-buffer (other-buffer buf))
    (switch-to-buffer-other-window buf)))

Edit: If you want shell to open in a new frame rather than new window, replace switch-to-buffer-other-window with switch-to-buffer-other-frame.

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  • And is it possible to make this the default behavior?
    – Name
    Jun 30, 2015 at 20:24
  • @Name: you could probably adapt this code to write some advice for shell.
    – Dan
    Jun 30, 2015 at 20:26
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The canonical way of altering the display behaviour for a buffer is to customize display-buffer-alist:

(setq display-buffer-alist '(("\\`\\*e?shell" display-buffer-pop-up-window)))
(setq display-buffer-alist '(("\\`\\*e?shell" display-buffer-pop-up-frame)))

It's a bit easier with my shackle package though:

(setq shackle-rules '(("\\`\\*e?shell" :regexp t :popup t)))
(setq shackle-rules '(("\\`\\*e?shell" :regexp t :frame t)))
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0

I wanted to have different functions for opening eshell as a popup and normally. I decided that I could just use a different buffer name for popups and add a different rule to display-buffer-alist:

(defun eshell-popup (&optional buffer-name)
  (interactive)
  (unless buffer-name (setq buffer-name "*eshell-popup*"))
  (let ((eshell-buffer-name buffer-name))
    (eshell)))

(add-to-list 'display-buffer-alist
             '("\\*eshell-popup\\*"
               (display-buffer-in-side-window (side . bottom))))

That way you can call eshell or eshell-popup depending on what you want.

Hope it helps someone in my situation.

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