LUNAR (Lockdown UNix Auditing and Reporting) is a shell script-based security auditing tool that evaluates Unix host configurations against established security frameworks. The tool generates scored audit reports by assessing system security posture based on CIS (Center for Internet Security) benchmarks and other security standards. It operates across all Unix variants using only shell script functions, ensuring broad compatibility without requiring additional dependencies. LUNAR provides both auditing and remediation capabilities, allowing administrators to perform security lockdowns based on identified vulnerabilities and misconfigurations. The tool includes a backout feature that enables administrators to reverse applied changes if needed. The scoring system provides quantitative assessment of security compliance, helping organizations understand their current security posture and prioritize remediation efforts. Reports detail specific security findings and provide actionable recommendations for improving system hardening.