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When the minibuffer offers tab completion, how can I make that case-insensitive?

Preferably a global setting that makes any completion – a filename, a command, ido, etc. – obey that setting.

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Sure. Set variable completion-ignore-case to t. Put this in your init file:

(setq completion-ignore-case  t)

C-h v completion-ignore-case:

completion-ignore-case is a variable defined in C source code.

Its value is nil

Documentation:

Non-nil means don't consider case significant in completion.

For file-name completion, read-file-name-completion-ignore-case controls the behavior, rather than this variable.

For buffer name completion, read-buffer-completion-ignore-case controls the behavior, rather than this variable.

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  • Can you update the answer to say which version of Emacs this appears in? Also, why this doesn't appear in the ‘completion’ group for Customize? – bignose Apr 28 '17 at 5:14
  • It appears in every GNU Emacs version I'm aware of, going back at least as far as Emacs 20. Did you try C-h v completion-ignore-case? Does your Emacs version not find this variable? Are you using GNU Emacs or some other Emacs? – Drew Apr 28 '17 at 14:44
  • It does not appear in M-x customize-group completion because it is not a user option. You can set it but you cannot set it using Customize. The most common use of it is to bind it (not assign it) in a given command. But nothing prevents you from assigning it, to affect the general behavior. – Drew Apr 28 '17 at 14:46

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