Prevent accidental commits of files

_README.md

copy pre-commit into the repo's .git/hooks/ folder, then try committing a file that has the string DO_NOT_COMMIT_THIS in it.

pre-commit

#! /bin/sh -e
disallowed="DO_NOT_COMMIT_THIS"

git diff --cached --name-status | while read x file; do
        if [ "$x" == 'D' ]; then continue; fi
        for word in $disallowed
        do
            if egrep $word $file ; then
                echo "ERROR: Disallowed expression \"${word}\" in file: ${file}"
                exit 1
            fi
        done
done || exit $?