Summary

In this chapter, we explored Linux user and group management, a crucial aspect of system security, stability, and resource allocation. We began by introducing the concept of user management and explained how to use commands such as useradd, userdel, and usermod to add, remove, and modify users on a Linux system. We also covered how to verify and set password expiration using the pwck, chage, and passwd commands, ensuring that user accounts remain secure.

The second section focused on file permissions and security basics, essential knowledge for any system administrator. We discussed the various file and directory permissions and how to use commands such as chmod and chown to modify them. In the third section, we delved into group management and covered commands such as groupadd, groupmod, groupdel, and grpck. We explained how groups allow for the efficient management of multiple users with similar permissions and access, and we learned how to use these commands to create...