root@host:~# ls -l foo.txt 
-rw-r--r-- 1 root root 0 2008-05-02 15:53 foo.txt
root@host:~# 
root@host:~# chown KDC+wneu foo.txt 
root@host:~# 
root@host:~# chgrp KDC+asp foo.txt
root@host:~# 
root@host:~# ls -l foo.txt 
-rw-r--r-- 1 KDC+wneu KDC+asp 0 2008-05-02 15:53 foo.txt
root@host:~#