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Lynis is an open source command-line auditing tool for Linux/UNIX specialists. It is designed to scan the system configuration and create an overview of the system information and security issues, which can later by used by professional auditors. As mentioned, Lynis is a cross-platform application. It has been successfully tested on various GNU/Linux distributions, including CentOS, Arch Linux, BackTrack, ClearOS, Fedora, Gentoo, Red Hat Enterprise Linux, Kali, Linux Mint, Knoppix, Mageia, PCLinuxOS, Sabayon, Scientific Linux, Slackware, SuSE, Ubuntu and Debian, several BSD flavors, such as DragonFly BSD, PC-BSD, NetBSD, FreeBSD and OpenBSD, as well as on the Mac OS X, AIX, OpenSolaris and HP-UX operating system. Both 32-bit and 64-bit instruction set architectures are supported at this time. Lynis is a complete solution, useful for configuration management, technical auditing, system hardening, security incident detection and system monitoring. It can be successfully used on enterprise environments, as well as on small and medium-sized businesses.