Linux is Everywhere!
- Linux is everywhere, Linux jobs are everywhere, there is a shortage of Linux talent, and, Linux skills are in demand in just about every industry and job category on the planet.
Linux is a Kernel
- Linux means the kernel of the system, which is the central controller of everything that happens on the computer.
- Linux is a combination of software called GNU/Linux, which defines the operating system.
- GNU is the free software that provides open source equivalents of many common UNIX commands.
- The Linux part of this combination is the Linux kernel, which is the core of the operating system.
- The story of Linux begins with UNIX, an operating system developed at AT&T Bell Labs in the 1970s.
- UNIX is written in the C language.
- Linux started in 1991 as a hobby project by Linus Torvalds, a Finnish born computer scientist studying at the University of Helsinki.
- The GNU Project was developed Linux by Richard Stallman in 1983.
- Linux programmers were able to incorporate the GNU tools to provide a complete operating system.
Linux is Open Source
- Historically, most software has been issued under a closed-source license.
- This means that you get the right to use the executable program or machine code, but cannot see the source code.
- The development of Linux closely parallels the rise of open source software.
- The open source philosophy is that you have a right to obtain the software source code and to modify it for your own use.
Linux Has Distributions
- A distribution refers to the Linux kernel, tools, and suite of applications that come bundled together.
- Take Linux and the GNU tools, add some user-facing applications like a web browser and an email client, and you have a full Linux system.
- There are distributions suited to every imaginable purpose.
- There are distributions that focus on running servers, desktops, or even industry-specific tools like electronics design or statistical computing.
Linux Embraces the CLI
- There are two basic types of interfaces available that allow you to interact with the operating system.
- The typical computer user today is most familiar with a graphical user interface (GUI).
- In a GUI, applications present themselves in windows that can be resized and moved around.
- There are menus and tools to help users navigate.
- The second type of interface is the command line interface (CLI), a text-based interface to the computer.
- The CLI relies primarily on keyboard input.
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