Operating systems - meaning and definition. What is Operating systems
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What (who) is Operating systems - definition

SOFTWARE THAT MANAGES COMPUTER HARDWARE RESOURCES
Operating System; Operatingsystem; Operating systems; Operating Systems; Operation system; Computer operating sysem; General-purpose operating system; Desktop operating system; Desktop OS; Desktop os; Computer operating system; Operative system; Operating System Types; GPOS; OPSYS; Desktop operating systems; Desktop system; Computer OS; Library OS; Library Operating Systems
  • bash]] command line. Each command is typed out after the 'prompt', and then its output appears below, working its way down the screen. The current command prompt is at the bottom.
  • File systems allow users and programs to organize and sort files on a computer, often through the use of directories (or "folders").
  • first server]] for the [[World Wide Web]] ran on NeXTSTEP, based on BSD.
  • [[OS/360]] was used on most [[IBM]] mainframe computers beginning in 1966, including computers used by the [[Apollo program]].
  • A screenshot of the [[KDE Plasma 5]] graphical user interface. Programs take the form of images on the screen, and the files, folders (directories), and applications take the form of icons and symbols. A mouse is used to navigate the computer.
  • A kernel connects the application software to the hardware of a computer.
  • PC DOS was an early personal computer OS that featured a command-line interface.
  • Privilege rings for the [[x86]] microprocessor architecture available in [[protected mode]]. Operating systems determine which processes run in each mode.
  •  archive-date = August 15, 2010 }}</ref>
  • Ubuntu]], desktop [[Linux distribution]]
  • Many operating systems can "trick" programs into using memory scattered around the hard disk and RAM as if it is one continuous chunk of memory, called virtual memory.

operating system         
(operating systems)
The operating system of a computer is its most basic program, which it needs in order to function and run other programs. (COMPUTING)
N-COUNT
Operating system         
An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs.
operating system         
¦ noun the low-level software that supports a computer's basic functions.

Wikipedia

Operating system

An operating system (OS) is system software that manages computer hardware and software resources, and provides common services for computer programs.

Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources.

For hardware functions such as input and output and memory allocation, the operating system acts as an intermediary between programs and the computer hardware, although the application code is usually executed directly by the hardware and frequently makes system calls to an OS function or is interrupted by it. Operating systems are found on many devices that contain a computer – from cellular phones and video game consoles to web servers and supercomputers.

The dominant general-purpose personal computer operating system is Microsoft Windows with a market share of around 74.99%. macOS by Apple Inc. is in second place (14.84%), and the varieties of Linux are collectively in third place (2.81%). In the mobile sector (including smartphones and tablets), Android's share is 70.82% in the year 2020. According to third quarter 2016 data, Android's share on smartphones is dominant with 87.5 percent with a growth rate of 10.3 percent per year, followed by Apple's iOS with 12.1 percent with per year decrease in market share of 5.2 percent, while other operating systems amount to just 0.3 percent. Linux distributions are dominant in the server and supercomputing sectors. Other specialized classes of operating systems (special-purpose operating systems), such as embedded and real-time systems, exist for many applications. Security-focused operating systems also exist. Some operating systems have low system requirements (e.g. light-weight Linux distribution). Others may have higher system requirements.

Some operating systems require installation or may come pre-installed with purchased computers (OEM-installation), whereas others may run directly from media (i.e. live CD) or flash memory (i.e. USB stick).

Examples of use of Operating systems
1. Some computer manufacturers were already moving towards pre–installing operating systems.
2. Eventually, Sharpcast‘s platform could be built into applications from other companies and support other operating systems.
3. The dispute is over a technology that allows operating systems to handle large amounts of data.
4. Its operating systems power nine out of 10 personal computers today.
5. The dispute centres on the market for "work group server operating systems". These are the operating systems that run on central network computers which provide services such as file and printer sharing, security and user identities.