[BlueOnyx:08368] limit ssh access

[Gregg]

Hello,
I have a user that needs shell access.  How do I give him shell access
without having them be able to see the entire system directory?  I created
the user, and when I log in as him, I log in to his personal directory, but
if I change directory /
I get the entire system directory.  He can't do much, but just the fact that
he can see all those files to me is a security issue.  Is there a way that I
can lock him into his personal directory and not have him be able to look
anywhere else?
Thanks.