AFTER A SYSTEM IS BOOTED AND RUNNING, it lives to serve users. Linux systems can have multiple users. This may mean that multiple users could be logged in at the same time, both on the system directly as well as remotely. Typically, a single user would be using a system. This is especially true when it comes to desktop systems. However, multiple users have been configured on any Linux system, including the normal user as well as the root user. Additionally, different services will configure other user accounts that those services will run as. Users have permissions to resources, ...
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