A little extra from me for you mybrader fo :D

Unix is designed to be portable, multi-tasking and multi-user in time-sharing configurations.

Unix systems are characterized by various concepts: the use of plain text to store data; hierarchical file system; treat the device and some kind of inter-process communication (IPC) as a file; and the use of a large number of software, small programs that can be merged together through a command-line interpreter using pipes, as opposed to the use of a single monolithic program that includes all of the same functions. These concepts are collectively known as the "Unix Philosophy".

Brian Kernighan and Rob Pike summarize this in the Unix Programming Environment as "the idea that more system power comes from relationships between programs than from the program itself".