gistfile1.txt

for file in `git diff-tree --no-commit-id --name-only -r HEAD | sort | uniq`
    do
        if [ ${file: -3} == ".py" ]
        then
         flake8 --ignore=E121,E123,E124,E125,E126,E127,E128 $file
        fi
        if [ ${file: -3} == ".js" ]
        then
         jshint $file
        fi
    done

To get it to work as a pre-commit hook that would abort the commit on errors I had to do the following:

#!/bin/sh

exit_code=0

for file in `git diff --cached --name-only --diff-filter=ACM | sort | uniq`
    do
        if [ ${file: -3} == ".py" ]; then
            flake8 --ignore=E121,E123,E124,E125,E126,E127,E128,E501 $file
            if [ "$?" -ne "0" ]; then
                exit_code=1
            fi
        fi
        if [ ${file: -3} == ".js" ]; then
            jshint $file
            if [ "$?" -ne "0" ]; then
                exit_code=1
            fi
        fi
    done

if [ "$exit_code" -ne "0" ]; then
    echo "Aborting commit. Fix above errors or do 'git commit --no-verify'."
    exit 1
fi

how do you use yours?