Change commit author or email

git-filter-branch

git filter-branch --commit-filter \
'if [ "$GIT_AUTHOR_NAME" = "OldAuthor Name" ]; then \
export GIT_AUTHOR_NAME="Author Name";\
export GIT_AUTHOR_EMAIL=authorEmail@example.com;\
export GIT_COMMITTER_NAME="Commmiter Name";\
export GIT_COMMITTER_EMAIL=commiterEmail@example.com;\
fi;\
git commit-tree "$@"'