If you accidentally make some commits with your email (or name) set incorrectly, this script fixes it. With no arguments, it updates all commits with your name to use your email address according to Git config. Don't use this on a branch you're collaborating on.

git-replace-author

DEFAULT_NAME="$(git config user.name)"
DEFAULT_EMAIL="$(git config user.email)"
export OLD_NAME="${1:-$DEFAULT_NAME}"
export NEW_NAME="${2:-$DEFAULT_NAME}"
export NEW_EMAIL="${3:-$DEFAULT_EMAIL}"

echo "Old:" $OLD_NAME "<*>"
echo "New:" "$NEW_NAME <$NEW_EMAIL>"
echo "To undo, use: git reset $(git rev-parse HEAD)"

git filter-branch --env-filter \
'if [ "$GIT_AUTHOR_NAME" = "${OLD_NAME}" ]; then
	export GIT_AUTHOR_NAME="${NEW_NAME}"
	export GIT_AUTHOR_EMAIL="${NEW_EMAIL}"
	export GIT_COMMITTER_NAME="${NEW_NAME}"
	export GIT_COMMITTER_EMAIL="${NEW_EMAIL}"
fi'