L-nix is an interactive UNIX tutorial program that teaches beginner to advanced concepts of the UNIX operating system. L-nix includes a simple UNIX shell simulator allowing users to try out commands as they are learned. The L-Nix demo contains 10 modules:Introduction of UNIX, File characteristics, Korn shell customization, Processes and linking, Command substitutions, Finding files, and more. The Registered version of L-nix provides nine additional modules: UNIX and Files, Directories, Introduction to the Korn shell, Redirection and Pipes, Useful Tools, Communicating with Other Users, and Kornshell Programming Follow the link and free download L-Nix now.