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Source: Linux-Mag - Posted by Bill Keys
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A Linux system has two kinds of users: ordinary users and the root user. Each ordinary user has a robust set of permissions to manage his or her own files (and files that belong to a group that he or she is a member of), but an ordinary user cannot affect system configuration, start or stop essential services such as the SSH daemon, and cannot reserve a so-called privileged port, or any networking port numbered less than 1,024. The root user, though, is free to access and modify any file, perform any task, and affect the system at will.
It's an important to learn how to use sudo securely. This article does a good job at helping users to setup sudo for their systems.
Read this full article at Linux-Mag
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