Remove trailing whitespace

• From a current line:

:s/\s\+$//

• From entire file:

:%s/\s\+$//

Explanation:

• % = from whole file

• s = search and replace

• \s\+$ = regex searching for spaces til the end of a line

• / = replacement value (empty string)

Source: http://stackoverflow.com/questions/3474709/delete-all-spaces-and-tabs-at-the-end-of-my-lines