Lynis is a free security audit tool. Lynis is designed in focusing the customers from fields like auditing, system administration, security specialist and penetration testers. It scans the system for security issues, configuration mistakes, wrong file permissions, installed and possible software information’s. Whenever we run Lynis it checks for the operating system, tools, runs test from enabled plugins, security test. It stores all the processed data in a log file. Lynis supports dynamic OS detection, customized test, plugin supports. It also provides warnings and their suggestions from the test reports.