Update email and user name in the git history

gitemail

git filter-branch -f --commit-filter '
        if [ "$GIT_AUTHOR_EMAIL" = "[email protected]" -o  "$GIT_AUTHOR_EMAIL" = "[email protected]" ];
        then
                GIT_AUTHOR_NAME="User Name";
                GIT_AUTHOR_EMAIL="[email protected]";
                git commit-tree "$@";
        else
                git commit-tree "$@";
        fi' HEAD

# Reference:
# http://git-scm.com/book/en/Git-Tools-Rewriting-History

git commit --amend --no-edit --author="User Name <[email protected]>"

http://stackoverflow.com/questions/3042437/change-commit-author-at-one-specific-commit

If only the latest one.