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The author of "The Definitive Guide to SUSE Linux Enterprise Server" talks about SGID and SUID uses, how to make device sharing easier and more.
Advanced permissions can be very useful, but very dangerous as well. Let's talk about SUID, first. This permission is meant to be used on executable program files only when strictly necessary. In my opinion, it is better not to use them at all. They can provide an excellent backdoor for a hacker if used not in the right way.
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