I have a lot of files on my system without extensions (i.e., files like todo, list_of_stuff, etc). I would like these types of files to default to markdown-mode for their major mode. How to do this? In case it matters, I'm running spacemacs.

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From the Emacs "Major Modes" info topic (C-h i d m emacs m major), try adding this to your spacemacs user-config:

(setq-default major-mode 'markdown-mode)

The "Choosing Modes" info will be a good resource if you need more nuance.

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