Removing trailing whitespace

README.markdown

Remove trailing whitespace from text files in a git repo.

From git help grep:

-l, --files-with-matches, --name-only, -L, --files-without-match
    Instead of showing every matched line, show only the names of files that contain
    (or do not contain) matches. For better compatibility with git diff, --name-only
    is a synonym for --files-with-matches.
-I
    Don’t match the pattern in binary files.
-E, --extended-regexp, -G, --basic-regexp
    Use POSIX extended/basic regexp for patterns. Default is to use basic regexp.

And, from man sed:

-i[SUFFIX], --in-place[=SUFFIX]
    edit files in place (makes backup if SUFFIX supplied)

remove-trailing-whitespace.bash

#!/usr/bin/env bash

for f in $(git grep --files-with-matches -I --extended-regexp '^.+[ ]+$')
do
  sed --in-place 's/[[:space:]]*$//' "$f"
done