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User Security

As I mentioned earlier in the book, Linux is a multiuser operating system, meaning that one or more users can work on it at the same time. What this also means is that each person using your system is an individual, with his or her own home directories, files, menus, and desktop decorations. By creating a login for each member of your family or office, you not only protect the files that belong to each user, but you also protect yourself. If little Natika deletes all her icons or changes the desktop to a garish green and purple, it doesn't affect you. Similarly, this is a great opportunity to create a play world for the kids.

Each user is referenced by a username. Each username has a user ID (UID) associated with it and one or more groups. Like usernames, group names are represented by a numeric identifier, this time called a group ID (GID). A person's UID is unique, as is a group's GID.


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