Replace/modify committer name & email of all Git historical commits

git-replace-committer-email.sh

#!/bin/sh

# Replace/modify committer name & email of all Git historical commits
# git-replace-committer-email.sh v1 git@tanshuai.com 
# Usage: 
# cd <git repo>
# sh ../git-replace-committer-email.sh
# git push --force --tags origin HEAD:main

git filter-branch -f --env-filter '
OLD_EMAIL="old@email.com"
CORRECT_NAME="NEW NAME"
CORRECT_EMAIL="new@email.com"
if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_COMMITTER_NAME="$CORRECT_NAME"
    export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_AUTHOR_NAME="$CORRECT_NAME"
    export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags