Up to this point, you've gotten an overview of: Linux server systems, Linux desktop systems, Linux application software programs, what Linux system administration is, and the benefits of using the GNU Linux commands.

We've also talked about how the Linux OS is similar in many ways to the Windows OS.

The Linux Operating System (OS)

Now we're going to discuss what an operating system is, the main software components of Linux, and the benefits of

using the Linux operating system (OS).

This Linux OS background information will help you to understand the development of Linux and further understand what Linux commands are, how they're used and why you need to run Linux commands to do Linux system administration.

The UNIX Operating System

UNIX is a very popular and relatively expensive computer operating system that first became available for large mainframe computers and minicomputers. It was created about thirty years ago by Ken Thompson and Dennis Richie at AT&T Bell labs. Over time, it has been developed by many people at various different organizations and has evolved into several different, but similar, "variants" (a.k.a. dialects, versions). The UNIX variants have been sold by numerous major organizations, including IBM, Sun Microsystems and Hewlett-Packard.

From the beginning, UNIX was designed as a system that could run more than one program at once (a multitasking OS). UNIX is also a network operating system that can be accessed by many users at once (a multiuser OS). The architecture of the Internet was created with UNIX and it still plays a major part in the workings of the Internet.

Linux is rightly considered to be "UNIX-like" and "a free version of UNIX". The Linux OS was developed to follow the POSIX (Portable Operating System Interface for uniX) standard and is therefore POSIX-like. All major versions of UNIX are POSIX-like and so is Linux. Therefore, whenever anything in this book describes Linux, the same applies to UNIX, unless otherwise specified.

For example, Linux is a multitasking, multiuser operating system. This statement is also true for UNIX.

Getting Linux Commands Training The Easy Way With Linux Video Tutorials!

A very easy way to get Linux training is to watch Linux commands being run "live". And you can do this by watching Linux video tutorials - you get see and hear how command is run - then pause the video and do the steps to run the command yourself!

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