Trailing Whitespace

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There are different ways to handle trailing whitespace in Emacs


Visualize trailing whitespace[edit]

Just set the show-trailing-whitespace variable:

(setq show-trailing-whitespace t)


Delete trailing whitespace[edit]

You can delete trailing whitespace in the entire buffer using M-x delete-trailing-whitespace.


To automate trailing whitespace deletion before saving the buffer in certain modes, you can add local hooks, e.g:

(add-hook 'c-mode-hook (lambda () (add-to-list 'write-file-functions 'delete-trailing-whitespace)))


See also[edit]