[ale] Multiuser and Email

[naugrim at juno.com (Michael B Golden)]

1. I have decided to learn some more of the multiuser aspects of Linux.
What I want to know, is how do I make directories and files invisible to
a user, but not to others? Also, can I make certain programs available to
certain users and not to others? I don't quite understand the concept of
groups either. Does the group permissions override individual? For
example, if a file is invisible to a certain user, but not to the group
he belongs in, which takes precedence?

2. Can I use the email accounts created in linux for each account without
having a full time web server? (I wish I could have one, but money
prohibits. :(  )

3. Also, I have seen reference in the HOWTOs to files and directories
that begin with a period, and don't show up in ls, but when I edit the
directory (which I discovered by accident) in emacs, it shows the
existence. Is there a way to show these in ls? Why are they invisible?

---------------------------------------------------------------------------------------------------------------------
Michael Golden
Naugrim at Juno.com (Normal, no attachments)
MGolden at Airapps.com (Only for messages with attachments.)
Slackware 3.5 (2.0.34) Linux user -- Linux Advocate

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