Lynis is an open-source security auditing tool designed for Unix-based systems, such as Linux, macOS, and BSD. It is widely used by system administrators and security professionals to assess the security posture of their systems. Lynis performs comprehensive audits across various security aspects like file systems, services, user accounts, networking, and system hardening. It identifies vulnerabilities, misconfigurations, and compliance issues, offering actionable recommendations for improving system security and ensuring adherence to industry standards.

Features of Lynis:

• Comprehensive security auditing across multiple system components, including file systems, services, and user authentication.
• Checks for compliance with security standards like CIS Benchmarks, PCI-DSS, and HIPAA.
• Detailed reports with severity-based findings and actionable security recommendations.
• Modular design allowing customization and the ability to write custom security tests.
• Supports both interactive and automated audits, suitable for single systems or large enterprise environments.
• Open-source and free to use, with regular updates from the community.
• Scalable and integrates well with automation frameworks and centralized monitoring tools.

To run a Lynis audit, use: "./lynis show version".