Lynis is a popular security auditing tool designed for Unix-based systems, including Linux and macOS. It helps system administrators and security professionals assess and improve the security posture of their systems by performing in-depth scans and identifying potential vulnerabilities and misconfigurations.

Features of Lynis:

• Lynis performs extensive security scans, covering areas such as system configuration, file permissions, installed software, and network settings, providing a comprehensive overview of the system's security status.
• The tool offers detailed recommendations and actionable insights to help users harden their systems, based on industry best practices and security standards.
• Lynis supports a wide range of plugins and modules, allowing for flexible and customizable security assessments tailored to specific use cases and environments.
• With regular updates and an active community, Lynis stays up-to-date with the latest security trends and vulnerabilities, ensuring that users receive accurate and relevant information.

To check Lynis version:

$ cd /opt/lynis
$ lynis --version
  

Disclaimer: Lynis is an open-source security auditing tool released under the GPL-3.0 License. It is not associated with, endorsed by, or sponsored by any specific company. Lynis is provided "as is," without any warranty, express or implied. Users utilize this software at their own risk. The developers and contributors to Lynis disclaim any responsibility for any damages, losses, or consequences arising from the use of this software. Users are encouraged to review and adhere to licensing terms and any relevant regulations while utilizing Lynis.