Lynis is an open source security auditing tool. Its main goal is to audit and harden Unix and Linux based systems. It scans the system by performing many security control checks. Examples include searching for installed software and determine possible configuration flaws. After the scan, a report will be displayed with all discovered findings. Lynis can be used for auditors, network and system administrators, security specialists and penetration testers. It is compatible with many Operating Systems such as: Linux, MacOS X, Mageia, Mandriva, OpenSolaris, openSUSE, Oracle Linux and Red Hat Enterprise Linux.”]
Source: https://gbhackers.com/lynis-open-source-security-auditing-tool-a-detailed-explanation/