21 Facts About Operating system

Dominant general-purpose personal computer operating system is Microsoft Windows with a market share of around 76.

Real-time operating system is an operating system that guarantees to process events or data by a specific moment in time.

Library operating system is one in which the services that a typical operating system provides, such as networking, are provided in the form of libraries and composed with the application and configuration code to construct a unikernel: a specialized, single address space, machine image that can be deployed to cloud or embedded environments.

Basic operating system features were developed in the 1950s, such as resident monitor functions that could automatically run different programs in succession to speed up processing.

The name "UNIX" is a trademark of The Open Group which licenses it for use with any operating system that has been shown to conform to their definitions.

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Unlike its predecessor, macOS is a UNIX operating system built on technology that had been developed at NeXT through the second half of the 1980s and up until Apple purchased the company in early 1997.

Operating system posted information about his project on a newsgroup for computer students and programmers, and received support and assistance from volunteers who succeeded in creating a complete and functional kernel.

Microsoft Windows was first released in 1985, as an operating environment running on top of MS-DOS, which was the standard operating system shipped on most Intel architecture personal computers at the time.

Components of an operating system all exist in order to make the different parts of a computer work together.

Operating system provides an interface between an application program and the computer hardware, so that an application program can interact with the hardware only by obeying rules and procedures programmed into the operating system.

The operating system is a set of services which simplify development and execution of application programs.

Once an operating system kernel has been loaded and started, the boundary between user mode and supervisor mode can be established.

An operating system kernel contains a scheduling program which determines how much time each process spends executing, and in which order execution control should be passed to programs.

Under Windows, each file system is usually limited in application to certain media; for example, CDs must use ISO 9660 or UDF, and as of Windows Vista, NTFS is the only file system which the operating system can be installed on.

The function of the device driver is then to translate these operating system mandated function calls into device specific calls.

Operating system must be capable of distinguishing between requests which should be allowed to be processed, and others which should not be processed.

Also covered by the concept of requester identity is authorization; the particular services and resources accessible by the requester once logged into a Operating system are tied to either the requester's user account or to the variously configured groups of users to which the requester belongs.

An alternative strategy, and the only sandbox strategy available in systems that do not meet the Popek and Goldberg virtualization requirements, is where the operating system is not running user programs as native code, but instead either emulates a processor or provides a host for a p-code based system such as Java.

Real-time operating system is an operating system intended for applications with fixed deadlines .

An early example of a large-scale real-time operating system was Transaction Processing Facility developed by American Airlines and IBM for the Sabre Airline Reservations System.

Unix was the first operating system not written in assembly language, making it very portable to systems different from its native PDP-11.