System integrity is one of the most overlooked areas in Linux security. Firewalls, SELinux, and antivirus tools are common, but they do not tell you if critical system files were modified silently . This is where AIDE (Advanced Intrusion Detection Environment)  fits perfectly. In this blog, I’ll walk through what AIDE is, how it works, how to configure it properly , and how to interpret its output  on RHEL, Rocky Linux, and CentOS . All commands shown below were executed manu