Viewing a directory listing requires read permission on the directory, but entering the directory and viewing the files inside it requires execute permission on the directory. He could be talking about something like that, where he has read permission for everything but can't see some files because he doesn't have execute permission on all directories. That's not real security, and it wouldn't make a lot of sense, but not much about this situation seems to.

Aaron B.
My Woefully Neglected Blog, where I occasionally mention Perl.

In reply to Re^10: perl file status and sudo by aaron_baugher
in thread perl file status and sudo by Saved

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