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I'm wondering if it is possible to map control + forward-slash in vim. The mapping would be for normal mode if that makes a difference.

I have tried <c-/> but that didn't work.

I also tried looking at the :help keycodes docs but was unable to understand if it was possible.

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    it is often <c-_> – Mass Jul 25 '20 at 17:17
  • You can in xterm, with a recent Vim. You may need to specify the shift modifier, so try <c-s-/> in addition to <c-/>. – user938271 Jul 25 '20 at 20:14
  • @Mass I added your comment as a Community Wiki answer, as I could reproduce it. Not sure if this is the best conduct here, if not please apologize me. I could not find any reference to that, if you have it, please add it. – Quasímodo Jul 25 '20 at 23:11
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    @Quasímodo seems fine to me; I agree it would be great to have more detail, but answers belong in answers, not comments. – D. Ben Knoble♦ Jul 26 '20 at 13:37
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Use <C-_>. For example, to map Ctrl/ to :help,

noremap <C-_> :help<CR>

From :help :map-special-keys,

There are three ways to map a special key:

  1. The Vi-compatible method: Map the key code. Often this is a sequence that starts with <Esc>. To enter a mapping like this you type ":map " and then you have to type CTRL-V before hitting the function key. (...)

If I try :map CtrlVCtrl/, I get the ^_ symbol, indicating that the corresponding map is <C-_>. If you get some other sequence, map that instead.

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