UNIX

A popular kind of operating systems for servers and workstations.

More information and history available at Wikipedia: http://en.wikipedia.org/wiki/UNIX Blinkenshell runs Linux (or GNU/Linux if you prefer) which is a UNIX-like operating system, but not UNIX certified.

A list of common tools and how to use them is availabe at Wikipedia: http://en.wikipedia.org/wiki/List_of_Unix_programs The most important tools are probably a basic text editor like nano and basic filesystem utilities like cd, ls, chmod, rm, mv etc.

Take a look at this howto for File Management on UNIX-like systems: Howto/FileManagement.