19.3 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;
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 non-blank text. `M-x tabify'
scans the region for sequences of spaces, and converts sequences of at
least three spaces to tabs if that is possible without changing
indentation. `M-x untabify' changes all tabs in the region to
corresponding numbers of spaces.
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