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48. VI-style Line Number Mode

This library activates VI-style line numbering for a buffer.

M-x setnu-mode toggles the line number mode on and off.

turn-on-setnu-mode is useful for adding to a major-mode hook variable.

 
  (add-hook 'text-mode-hook 'turn-on-setnu-mode)

to automatically turn on line numbering when entering text-mode.

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