Chapter 1
System Management
Course: Comptia Linux Xk0 006
Subject: Comptia Linux Xk0 006
Chapter: Services And User Management
This lesson introduces Linux file and directory management alongside user and group administration. In Linux, security begins with controlling who owns files and what they are allowed to do with them, making these skills foundational for every administrator. Understanding ownership, permissions, links, special files, and account management is essential in real-world environments where many users share the same secure, multi-user Linux servers in cloud and hybrid infrastructures.
Lesson Objectives
- Explain Linux file ownership and manage permissions with chmod, chown, and chgrp.
- Apply special permission bits and create hard and symbolic links.
- Create, modify, and delete users and groups.
- Manage passwords, group membership, and user profile defaults.
Linux File Ownership
In Linux, every file and directory is owned by someone and associated with a group. Ownership determines who controls a file and forms the basis of Linux security. Because Linux was designed from the start as a multi-user system (a system many people use at once), it needs a clear way to decide who can read, change, or run each file, and ownership provides that foundation. On a shared server, dozens of users may store files in the same system, and without ownership, anyone could read or delete anyone else's data. Ownership lets the system enforce boundaries, ensuring users control their own files while administrators retain overall control.