Briefly describe the role of the operating system and give a few examples

The operating system (English: operating system, abbreviated as OS) is a computer program that manages computer hardware and software resources. It is also the core and cornerstone of the computer system.

The operating system needs to handle such things as managing and configuring memory, determining the priority of system resource supply and demand, controlling input devices and output devices, and operating Basic things like networking and managing file systems. The operating system also provides an operating interface for users to interact with the system. (Recommended learning: PHP video tutorial)

There are many types of operating systems. The operating systems installed on different machines can range from simple to complex, ranging from embedded systems for mobile phones to large-scale operating systems for supercomputers. Many operating system manufacturers have inconsistent definitions of what it covers. For example, some operating systems integrate a graphical user interface, while others only use a command line interface and regard the graphical user interface as a non-essential application.

DOS operating system

DOS is the abbreviation of Disk Operation System in English, and Disk Operating System in Chinese. Since the launch of version 1.0 in 1981, it has been upgraded to In version 6.22, the DOS interface uses character commands to operate and can only run a single task.

Windows operating system

Microsoft Windows operating system is an operating system developed by Microsoft Corporation in the United States. It came out in 1985 and was initially just a Microsoft-DOS simulation environment. , due to Microsoft's continuous updates and upgrades, subsequent system versions are not only easy to use, but have also slowly become people's favorite operating system in every household.

This software has gone through many years of development, and the win10 system currently launched is quite mature. The Windows operating system has the characteristics of good human-computer interaction, supports many application software, and has strong hardware adaptability. It is the current mainstream operating system for personal computers.

Linux operating system

Linux is a set of Unix-like operating systems that are free to use and freely disseminated. It is a multi-user, multi-tasking, support based on POSIX and UNIX Multi-threaded and multi-CPU operating systems. It can run major UNIX software tools, applications and network protocols. It supports 32-bit and 64-bit hardware. Linux inherits the network-centric design philosophy of Unix and is a multi-user network operating system with stable performance.

The Linux operating system was born on October 5, 1991 (this is the first time the date was officially announced to the outside world). There are many different Linux versions of Linux, but they all use the Linux kernel. Linux can be installed on a variety of computer hardware devices, such as cell phones, tablets, routers, video game consoles, desktop computers, mainframes, and supercomputers.

Strictly speaking, the word Linux itself only refers to the Linux kernel, but in fact people are accustomed to using Linux to describe the entire operating system based on the Linux kernel and using various tools and databases of the GNU project.

UNIX operating system

UNIX operating system (Eunice) is a powerful multi-user, multi-task operating system that supports multiple processor architectures. Follow the operation A classification of the system that belongs to the time-sharing operating system, which was first developed by Ken Thompson, Dennis Ritchie, and Douglas McIlroy in 1969 at AT&T's Bell Labs. Its trademark rights are owned by the International Open Standards Organization. Only UNIX systems that comply with the single UNIX specification can use the name UNIX, otherwise they can only be called UNIX-like.

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