What is LINUX

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Introduction

##　Linux is a set of Unix-like operating systems that are free to use and freely disseminated. It is a multi-system based on POSIX and UNIX. User, multitasking, multi-threading and multi-CPU operating system. 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). 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.

Main features

Basic idea

There are two basic ideas of Linux: First , everything is a file; second, every software has a definite purpose. The first one is that everything in the system is boiled down to a file, including commands, hardware and software devices, operating systems, processes, etc. For the operating system kernel, they are all regarded as files with their own characteristics or types. . As for Linux being based on Unix, it is largely because the basic ideas of the two are very similar.

Completely free

Linux is a free operating system that users can obtain for free through the Internet or other channels, and can modify its source code at will. This is something other operating systems cannot do. It is precisely because of this that countless programmers from all over the world have participated in the modification and writing of Linux. Programmers can change it according to their own interests and inspirations. This allows Linux to absorb the essence of countless programmers and continue to grow.

Fully compatible with POSIX1.0 standard

This makes it possible to run common DOS and Windows programs through corresponding emulators under Linux. This lays the foundation for users to switch from Windows to Linux. When many users consider using Linux, they think about whether programs that were previously common under Windows can run normally, and this eliminates their doubts. [4]

Multi-user, multi-tasking

Linux supports multiple users. Each user has its own special rights for its own file device, ensuring that the communication between users is guaranteed. Do not affect each other. Multitasking is one of the most important features of today's computers. Linux can enable multiple programs to run simultaneously and independently.

Good interface

Linux has both a character interface and a graphical interface. In the character interface, users can input corresponding instructions through the keyboard to perform operations. It also provides an X-Window system similar to the Windows graphical interface, which users can operate using the mouse. The X-Window environment is similar to Windows. It can be said to be a Linux version of Windows.

Supports multiple platforms

Linux can run on a variety of hardware platforms, such as platforms with x86, 680x0, SPARC, Alpha and other processors. In addition, Linux is an embedded operating system that can run on handheld computers, set-top boxes or game consoles. The Linux 2.4 kernel released in January 2001 has fully supported the Intel 64-bit chip architecture. At the same time, Linux also supports multi-processor technology. Multiple processors work at the same time, greatly improving system performance.

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