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From: Dan Anderson
Subject: Re: TAB
Date: Mon, 17 Nov 2003 19:45:53 -0500

While looking for something completely unrelated in the Emacs manual I

Tabs vs. Spaces

   Emacs normally uses both tabs and spaces to indent lines.  If you
prefer, all indentation can be made from spaces only.  To request this,
set `indent-tabs-mode' to `nil'.  This is a per-buffer variable, so
altering the variable affects only the current buffer, but there is a
default value which you can change as well.  *Note Locals::.

   There are also commands to convert tabs to spaces or vice versa,
always preserving the columns of all nonblank text.  `M-x tabify' scans
the region for sequences of spaces, and converts sequences of at least
three spaces to tabs if that can be done without changing indentation.
`M-x untabify' changes all tabs in the region to appropriate numbers of

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