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...automatically before commit) You can tell git to react on trailing whitespace in a pre-commit hook. By default it will cancel a commit that contains trailing whitespace (and disallow...

...in $PREFIX/share/git-core/templates/hooks (where $PREFIX is probably /usr/local or /usr). Rename the pre-commit.sample file to pre-commit to activate it. Afterwards, you'll need to re-initialize already cloned repositories with...