Changing Git Commit Email Address

Easy bash script to change the emails used in a git repo

To change the email address for all commits in your Git repository to a new correct one, you can use the git filter-branch command. Here's a step-by-step process:

  1. First, ensure you have the correct email set for future commits:

    git config user.email "your-new-correct-email@example.com"

  2. Then, run the following command to rewrite the history:

    git filter-branch --env-filter '
OLD_EMAIL="your-old-incorrect-email@example.com"
CORRECT_EMAIL="your-new-correct-email@example.com"
if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL" ]
then
    export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags

    Replace your-old-incorrect-email@example.com with the wrong email you used, and your-new-correct-email@example.com with your correct email.

  3. After running this command, Git will rewrite your repository's history, changing the email address for all commits.

  4. If you've already pushed your commits to a remote repository, you'll need to force push the changes:

    git push --force --tags origin 'refs/heads/*'

Be cautious with this operation, especially if you're working on a shared repository, as it rewrites history. This can cause issues for other contributors if they've based work on the old history.

source: Claude sonnet 3.5 :)

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