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2. Operating system - Wikipedia

   en.wikipedia.org/wiki/Operating_system

   A real-time operating system (RTOS) is an operating system intended for applications with fixed deadlines ( real-time computing ). Such applications include some small embedded systems, automobile engine controllers, industrial robots, spacecraft, industrial control, and some large-scale computing systems.

3. Linux - Wikipedia

   en.wikipedia.org/wiki/Linux

   Linux is the leading operating system on servers (over 96.4% of the top one million web servers' operating systems are Linux), leads other big iron systems such as mainframe computers, and is used on all of the world's 500 fastest supercomputers (as of November 2017, having gradually displaced all competitors).

4. Unix - Wikipedia

   en.wikipedia.org/wiki/Unix

   The Unix operating system consists of many libraries and utilities along with the master control program, the kernel. The kernel provides services to start and stop programs, handles the file system and other common "low-level" tasks that most programs share, and schedules access to avoid conflicts when programs try to access the same resource ...

5. How to Find Out if You Have the Most Updated Operating System

   www.aol.com/.../blog/most-updated-operating-system

   An operating system is a software program that allows users to interact with the computer or mobile device and run applications (like Microsoft Office, Google Chrome, Facebook, etc). Examples of ...

6. Shell (computing) - Wikipedia

   en.wikipedia.org/wiki/Shell_(computing)

   In computing, a shell is a computer program that exposes an operating system 's services to a human user or other programs. In general, operating system shells use either a command-line interface (CLI) or graphical user interface (GUI), depending on a computer's role and particular operation. It is named a shell because it is the outermost ...

7. System software - Wikipedia

   en.wikipedia.org/wiki/System_software

   System software was usually supplied by the manufacturer of the computer hardware and was intended to be used by most or all users of that system. Many operating systems come pre-packaged with basic application software. Such software is not considered system software when it can be uninstalled without affecting the functioning of other ...