Change git commit author for multiple commits

git-change-author.sh

git filter-branch --env-filter '
WRONG_EMAIL="OLD_EMAIL"
NEW_NAME="NEW_NAME"
NEW_EMAIL="NEW_EMAIL"

if [ "$GIT_COMMITTER_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_COMMITTER_NAME="$NEW_NAME"
    export GIT_COMMITTER_EMAIL="$NEW_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_AUTHOR_NAME="$NEW_NAME"
    export GIT_AUTHOR_EMAIL="$NEW_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags

git-remove-backups.sh

git for-each-ref --format="%(refname)" refs/original/ | while read ref; do git update-ref -d $ref; done