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I'm fairly new to aquamacs/emacs and while editing I noticed that it indents however it wants. In order to indent the way I want I end up using M-i, but that is pretty cumbersome. So, how do I make the TAB key behave like M-i (that is, inserting 4 spaces whenever I press it, regardless of the type of file I am editing)?

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    Basically, you want to bind the command that M-i calls to the tab key. You can check what command that is with C-h k M-i (describe-key). You can also have a look at how to bind keys in the Emacs manual and on Xah Lee's tutorial. Just a heads-up, though: a lot of packages and libraries make extensive use of the tab key for things other than indentation, so you may not want to overwrite those bindings. – Dan Jan 9 '15 at 22:43
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You can find out the command that is executed by M-i,

C-h k M-i

and bind it to TAB:

(global-set-key (kbd "TAB") #'tab-to-tab-stop)

However, this will set the global binding, while you are most likely concerned with the binding of one or more global modes:

(add-hook c-mode-common-hook #'(lambda () (local-set-key (kbd "TAB" #'tab-to-tab-stop))))

But perhaps it would be better if you could describe what are your issues with Emacs' indentation (in a different question), so we can help you solve that.

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