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Vim remove trailing spaces

To remove all trailing spaces in vim, use the following command:

Code
:%s/ \{1,}\n/\r/gc
 

Explained:

Code
: - command
%s - entire selection
/ - separator
 \{1,}\n - search for one or more spaces followed by a newline
/ - separator
\r - replace with a newline
/ - separator
g - global replace
c - confirm replacements (type y (yes) to confirm replacements)