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It's actually GIDs and SUIDs. They stand for GroupID and SuperUserID, respectively. The latter is also reffered to as SwitchUserID (see what 'su' stands for). There's also UserID=UID as well. All of them are numbers that refer to a user or group. A regular user usually has an UID>=1000 and probably the same GID, root will have 0/0.
There is also the concept of suid,gid and sticky bits, which set the permissions on files/directories.
See more info at http://www.linux-tutorial.info/modul...rial&pageid=69 http://rute.2038bug.com/node17.html.gz http://www.linux.com/howtos/Secure-P...TO/files.shtml
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