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Subject: Re: Replicate the following in the latest emacs version
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 (message from Albaro Pereyra on Mon, 17 Jun 2024 20:28:13 -0700)
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> From: Albaro Pereyra <albaropereyra22@gmail.com>
> Date: Mon, 17 Jun 2024 20:28:13 -0700
> 
> Hello,
> 
> I would like to replicate the following in the latest emacs version;
> 
> 
> ;;; Add line numbers to buffer
> (add-hook 'prog-mode-hook 'linum-mode)
>   (setq linum-format "%4d \u2502 ")
> 
> I manage to get the line number but not the line or \u2502 character

You need to explicitly load 'linum:

  (require 'linum)
  (add-hook 'prog-mode-hook 'linum-mode)
  (setq linum-format "%4d \u2502 ")