GIt commit name update

gistfile1.sh

git filter-branch -f --commit-filter '
        if [ "$GIT_COMMITTER_NAME" = "old-name" ];
        then
                GIT_COMMITTER_NAME="new-name";
                GIT_AUTHOR_NAME="new-name";
                GIT_COMMITTER_EMAIL="email@domain.name";
                GIT_AUTHOR_EMAIL="email@domain.name";
                git commit-tree "$@";
        else
                git commit-tree "$@";
        fi' HEAD