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How to manage groups, users and permissions?

Linux is a multiuser and multitasking operating system, ie, multiple users can work on the system simultaneously running several tasks at once. It is therefore, very important that the operating system allows the management and control of users.

Unix based systems organize all this by users and groups, where each user must be identified with a user name and password. During login, the password entered by each user, is encrypted and compared to the encrypted passwords that were previously stored in the system.

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