UNIX is an operating system developed in the sixties and is still prevalent. In this context we define an operating system as a group of programs that make a computer functional. UNIX is a stable, multi user and multi-tasking operating system, available for servers as well as for personal computers. This operating system has a graphical interface (GUI: graphical user interface) similar to the one in Microsoft Windows, which makes it easier to use. Nevertheless, there are some operations that cannot be executed through the graphical interface, so command line knowledge is necessary. Not everything
can be solved through a window! There are several UNIX versions, although every one share the same characteristics. The most popular version is GNU/Linux, which comes in several “flavors”, such as FEDORA, Red Hat, Centos, etc.
Based on “An Introduction to R” (W. N. Venables, D. M. Smith and the R CoreTeam)
R is a free software programming language and software environment for statistical computing and graphics. R is freely available and it compiles and runs on a wide variety of UNIX platforms, Windows and MacOS. You can download the complete source code, the precompiled binary distribution, the contributed extensions and documentation for R from the “Comprehensive R Archive Network” (CRAN): http://www.cran.r-project.org.