eintr: Indent Tabs Mode

 
 16.6 Indent Tabs Mode
 =====================
 
 By default, Emacs inserts tabs in place of multiple spaces when it
 formats a region.  (For example, you might indent many lines of text all
 at once with the ‘indent-region’ command.)  Tabs look fine on a terminal
 or with ordinary printing, but they produce badly indented output when
 you use TeX or Texinfo since TeX ignores tabs.
 
    The following turns off Indent Tabs mode:
 
      ;;; Prevent Extraneous Tabs
      (setq-default indent-tabs-mode nil)
 
    Note that this line uses ‘setq-default’ rather than the ‘setq’
 command that we have seen before.  The ‘setq-default’ command sets
 values only in buffers that do not have their own local values for the
 variable.
 
    SeeTabs vs. Spaces (emacs)Just Spaces.
 
    SeeLocal Variables in Files (emacs)File Variables.