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Managing groups
Now that we understand how to create, manage, and switch between user accounts, 
we'll need to understand how to manage 
groups
 as well. The concept of groups 
in Linux is not very different from other platforms and pretty much serves the 
exact same purpose. With groups, you can more efficiently control a user's access 
to resources on your server. By assigning a group to a resource (a file, a directory, 
and so on), you can allow and disallow access to users by simply adding them or 
removing them from the group.

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Chapter 2