Remove the read permissions. If somebody knows the fully qualified path name(fqpn), they can read that file and, by entension, execute the file if the file's bits are correctly set. But they cannot get a listing of the directory's contents. Be warned, though, that they can look at the permissions of any file to which they have the fqpn, ie, they can do an ls -l against the file.

Mik
Mik Firestone ( recovering sysadmin )