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Home/ Questions/Q 8638447
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Editorial Team
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Editorial Team
Asked: June 12, 20262026-06-12T10:43:51+00:00 2026-06-12T10:43:51+00:00

in emacs, I would like to remap \C-/ from undo to my own function

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in emacs, I would like to remap \C-/ from undo to my own function commenting the current region or the current line (if no region is selected). When I try something like this:

(global-set-key "\C-/" 'comment-or-uncomment-region-or-line)

I’m getting an error that

error: Invalid modifier in string

I was trying different ways of the keybinding, unfortunately with no success and googling for \C-/ was not very helpful either.

Thank you for your help.

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  1. Editorial Team
    Editorial Team
    2026-06-12T10:43:52+00:00Added an answer on June 12, 2026 at 10:43 am
    (global-set-key (kbd "C-/") 'comment-or-uncomment-region-or-line)
    
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