Install diffstat if you need a program which provides a summary of the
diff command's output. You'll need to also install diffutils.
-rwxr-xr-x 1 root root 56716 Sep 24 1999 /usr/bin/diffstat -rw-r--r-- 1 root root 1771 Sep 24 1999 /usr/man/man1/diffstat.1.gz