Lessons in Linux


March 20, 2019 by Oliver Bailey

Linux is a virtual tree of opportunity that has grown from a seedling just a few short years ago to a full-grown oak tree with plenty of branches for almost every type of IT career. Take the roots of what Linux is all about, follow the branches of how Linux is used across IT and nurture your career with Linux certifications for future growth and longevity.

Linux Roots Free Open-Source Software (FOSS)

At its core, Linux is open-source software (OSS), which means that anyone can examine, rewrite or study the source code to understand how it is written. You can get involved with development, visit a development wiki or ask questions of the community to better understand almost any area of the Linux operating system. You can also download Linux for free, along with all the tools to compile the system from scratch if you want the ultimate learning experience. And no fees or purchases are required to do any of the above – just your time and internet access. The Linux Evolution Linux is based on AT&T System V UNIX, which was designed to run U.S. telephone and cellular telephone networks. UNIX also provided the world with the C and C++ languages. Although it has been in development since 1991, it took 12 years to get from version 1.0 to 2.0, and the steps made were small compared to the system today. In contrast, Linux version 4.0 was released on April 12, 2015, and version 5.0 is due in 2019. Today, the Linux major release cycle takes only 25 percent of the time it did in the 1990s, a development time improvement of almost 75 percent. Linux Scalability Linux can be installed on any size computer, all from the same source code base. On the small end of the scale, we have the pocket BeagleBone computer, which is the size of a credit card. At the top end, we have an IBM series Z mainframe, which takes anywhere from a large room to a full floor of a building. And yes, Linux runs on the IBM series Z mainframes since kernel version 4.1 was introduced in 2015.


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