what is linux operating system

Linux is a POSIX-based multi-user, multi-task, multi-thread and multi-CPU operating system, a UNIX-like operating system; it can run major Unix tool software, applications and network protocols, and supports 32-bit and 64-bit hardware.

#The operating environment of this tutorial: CentOS 6 system, Dell G3 computer.

Linux, the full name of GNU/Linux, is a UNIX-like operating system that is free to use and freely disseminated. It is a multi-user, multi-task, multi-thread and multi-CPU operating system based on POSIX.

It can run major Unix tool software, 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.

Linux has hundreds of different distributions, such as debian and archlinux based on community development, and Red Hat Enterprise Linux, SUSE, Oracle Linux, etc. based on commercial development.

With the development of the Internet, Linux has received support from software enthusiasts, organizations, and companies around the world. In addition to maintaining a strong momentum of development in servers, it has also made great progress in personal computers and embedded systems. Users can not only intuitively obtain the implementation mechanism of the operating system, but also modify and improve Linux according to their own needs to maximize it to meet the needs of users.

Linux not only has stable system performance, but also is an open source software. Its core firewall components have high performance and simple configuration, ensuring system security. In many corporate networks, in order to pursue speed and security, Linux is not only used by network operation and maintenance personnel as a server, but even as a network firewall. This is a highlight of Linux.

Linux has the characteristics of open source, no copyright, and many users in the technical community. Open source allows users to tailor it freely, has high flexibility, powerful functions, and low cost. In particular, the network protocol stack is embedded in the system and can function as a router after proper configuration. These characteristics make Linux an ideal development platform for developing routing and switching equipment.

Advantages of the Linux operating system

1. Linux is composed of many microkernels, and its source code is completely open source;

2. Linux inherits Unix It has very powerful network functions. It supports all Internet protocols, including TCP/IPv4, TCP/IPv6 and link layer topology programs, etc., and can use the network characteristics of Unix to develop new protocol stacks;

3. The Linux system tool chain is complete, and a suitable development environment can be configured with simple operations, which can simplify the development process, reduce obstacles to simulation tools in development, and make the system highly portable;

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