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Groups and the Server
This page describes how group memberships are used to provide a measure of security and the limits inherent in the operating system.

If you are managing your web pages through rainbow, then you will have noticed that those pages belong to you and a group with your name (your group). The web servers are also part of your group and can read any files readable by your group. This means you can use the world permissions to grant access through the filesystem and group permissions to grant access through the web server.

There is only one problem with this scheme. Users are limited to being members of only 32 groups. This means that the server can only work this way with about 30 people. If this is a problem for you, the web server will let you know when you try to access the pages.

We are working on this, but a solution is a couple of weeks away. Until then, if you have the permissions -rwxr-x--- (you can read, write, execute, group read and execute, everyone else, nothing (execute is optional -- only if appropriate)) and the server can't serve out the file, then you are one of those caught by this problem. Email <j-smith@physics.tamu.edu> and you will be notified when this has been fixed. Until then, though, go ahead and make your files world readable so the server can see them.