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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, peripherals, and ...
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).
EOS – developed by ETA Systems for use in their ETA-10 line of supercomputers. EMBOS – developed by Elxsi for use on their mini-supercomputers. GCOS – a proprietary operating system originally developed by General Electric. MAI Basic Four – An OS implementing Business Basic from MAI Systems.
Unix ( / ˈjuːnɪks / ⓘ, YOO-niks; trademarked as UNIX) is a family of multitasking, multi-user computer operating systems that derive from the original AT&T Unix, whose development started in 1969 [1] at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.
The article "Usage share of operating systems" provides a broader, and more general, comparison of operating systems that includes servers, mainframes and supercomputers . Because of the large number and variety of available Linux distributions, they are all grouped under a single entry; see comparison of Linux distributions for a detailed ...
Comparison of operating systems. Comparison of Linux distributions. Comparison of BSD operating systems. Comparison of kernels. Comparison of file systems. Comparison of platform virtualization software. Comparison of DOS operating systems. List of operating systems. Live CD.
The Portable Operating System Interface ( POSIX; IPA: / ˈpɒz.ɪks / [1]) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. [1] POSIX defines both the system and user-level application programming interfaces (APIs), along with command line shells and utility interfaces, for ...
At macOS's core is a POSIX-compliant operating system built on top of the XNU kernel, (which incorporated large parts of FreeBSD kernel) and FreeBSD userland for the standard Unix facilities available from the command line interface. Apple has released this family of software as a free and open source operating system named Darwin.