max@serv$ whoami
max
max@serv$ ls -la ./defines.php
-rwxrwxrwx 1 max max 1985 2011-11-16 02:01 ./defines.php
max@serv$ chmod 0777 ./defines.php
max@serv$ rm ./defines.php
rm: cannot remove `./defines.php': Permission denied
max@serv$
如何删除此文件?