If you are new to Unix or Linux these reference guides will help you understand the basics to these proven operating systems. These learning tools were developed for training classes. They are easy-to-understand and have numerous examples. There are different versions of Unix, but all were developed from the original AT&T base version. The manuals were written using this base version.

Unix is a multitasking, multi-user computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs. The Unix operating system was first developed in assembly language, but by 1973 had been almost entirely recoded in C, greatly facilitating its further development and porting to other hardware. Today's Unix system evolution is split into various branches, developed over time by AT&T as well as various commercial vendors. organizations.

Unix operating systems are widely used in servers, workstations, mobile devices, Apple computers and even slot machines. The Unix environment and the client–server program model were essential elements in the development of the Internet and the reshaping of computing as centered in networks rather than in individual computers.
 
Introduction to Basic Unix Introduction to Basic Unix Administration
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