How to implement changing authorship for all commits in the project history while preserving other metadata?

To change the authorship of all commits in the Git history while preserving other metadata, you can use the git filter-branch command with the --env-filter option. This script allows you to modify environment variables responsible for the author and committer without changing the commit content.

Example of changing the author's and committer's name and email:

git filter-branch --env-filter '
if [ "$GIT_COMMITTER_EMAIL" = "old@example.com" ]; then
    GIT_COMMITTER_NAME="New Name"
    GIT_COMMITTER_EMAIL="new@example.com"
fi
if [ "$GIT_AUTHOR_EMAIL" = "old@example.com" ]; then
    GIT_AUTHOR_NAME="New Name"
    GIT_AUTHOR_EMAIL="new@example.com"
fi
' -- --all

After executing the command, the history will be rewritten with the new authorship, while other metadata (dates, messages, content) will be preserved. It is important to remember that rewriting history requires a force push and may affect collaboration with the repository.