rename users
git filter-branch --env-filter '
OLD_EMAIL="old@email.com"
NEW_EMAIL="new@email.com"
NEW_NAME="John Doe"
if test "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL"
then
GIT_AUTHOR_EMAIL=$NEW_EMAIL
GIT_AUTHOR_NAME=$NEW_NAME
fi
if test "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL"
then
GIT_COMMITTER_EMAIL=$NEW_EMAIL
GIT_COMMITTER_NAME=$NEW_NAME
fi' -- --all