In this chapter, you learned about some advanced user management and how to manage users through the command line, along with password aging, quota, exposure to /etc/sudoers, and how to modify them using visudo. User and password management is a regular task that a system administrator performs on servers, and it has a very important role in the overall security of the system.

In the next chapter, we will look into advanced security features called Security-Enhanced Linux (SELinux), which comes integrated with CentOS or RedHat Linux operating systems.

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