Script to modify the author and commiter name & e-mail ID in the GIT tree

change-author.sh

#!/bin/sh
git filter-branch --commit-filter '
        if [ "$GIT_COMMITTER_NAME" = "<Old commit name>" ];
        then
                GIT_COMMITTER_NAME= "<New commit name>";
                 GIT_AUTHOR_NAME="<New author name>";
                GIT_COMMITTER_EMAIL="<New commit email>";
                GIT_AUTHOR_EMAIL="<New author email>";
                git commit-tree "$@";
        else
                git commit-tree "$@";
        fi' HEAD