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What language is linux written in?

Linux operating system mainly includes kernel and component system. Most of the kernel is written in C language, but some parts are written in assembly language, because assembly has better performance and speed for hardware. Most of the component systems and additional applications of Linux are written in C, C++, Python, perl and other languages.

What language is shell written in?

Shell itself is a program written in C language, and it is a bridge for users to use Linux. Shell is both a command language and a programming language. As a command language, it interactively interprets and executes commands entered by users; as a programming language, it defines a variety of variables and parameters, and provides many control structures that are unique in high-level languages, including loops and branches.

Although it is not a part of the core of the Linux system, it invokes most of the functions of the system core to execute programs, establish files and coordinate the operation of each program in a parallel way. Therefore, for users, shell is the most important utility, in-depth understanding and proficiency in the characteristics of shell and how to use it is the key to make good use of Linux system.

It can be said that the proficiency in using shell reflects the proficiency of users in using Linux.

What is shell?

Shell is actually a command interpreter that interprets commands entered by the user and sends them to the kernel. Not only that, Shell has its own programming language for editing commands, which allows users to write programs made up of shell commands. Shell programming language has many characteristics of common programming language, for example, it also has loop structure and branch control structure. Shell programs written in this programming language have the same effect as other applications.

Linux provides a visual command input interface like MicrosoftWindows-the graphical user interface (GUI) of X Window. It provides a lot of desktop environment systems, which operate like Windows, with windows, icons and menus, all of which are controlled by the mouse. GNOME .

Users of each Linux system can have their own user interface or Shell to meet their own specialized Shell needs.

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Compared with other operating systems, Linux has the characteristics of open source, no copyright and many users in the technical community. Open source enables users to cut freely, with high flexibility, powerful functions and low cost. In particular, the network protocol stack is embedded in the system, which can realize the function of the router after proper configuration. These characteristics make Linux an ideal development platform for developing routing switching devices.

Linux not only has stable system performance, but also has high performance and simple configuration of its core firewall components, which ensures the security of the system. In many enterprise networks, in order to pursue speed and security, Linux operating system is not only used as a server by network operators, Linux can be used not only as a server, but also as a network firewall is a bright spot of Linux.

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