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This article will explain in detail what the Shell programming in the Linux operating system is like, and the content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Shell is not only a command interpreter, but also an interpreter of a command language. The command line entered by the user when interacting with Shell must conform to the syntax and semantic specification of Shell commands before it can be understood and executed by Shell. The command language used by Shell is called the Shell language. Shell is not only an interactive language, but also a programmable programming language. Writing several Shell command lines into a file constitutes a Shell program that can be interpreted and executed by Shell one by one. The Shell program written in shell language can use a variety of variables, parameters and control structures to organize the command flow and automatically complete a variety of complex and tedious processing work.

Shell program is widely used in Linux system to realize the start-up, configuration, management and maintenance of the system. Therefore, proficient in the Shell language can further understand the operating mechanism of the system, and use and manage the system more effectively.

Features of the Shell language:

Compared with other programming languages, Shell has the following characteristics:

(1) Shell is an interpretive language. That is to say, programs written in shell do not need to be compiled and can be interpreted and executed directly by the Shell process. Interpretive language is characterized by its rapidness and convenience, which can be compiled and used immediately, but compared with the target program of compiled language, the running speed of interpretive language program is lower.

(2) Shell is a string-based language. Shell only does string processing and does not support complex data structures and operations. The output of Shell is also all in character mode.

(3) Shell is a command-level language. Shell programs are all composed of commands rather than statements, and almost all Shell commands and executable programs can be used to write Shell programs. Shell commands are very rich, and the combination of commands is also very powerful. Therefore, the Shell program formed by the combination of simple commands and commands is simple and efficient, and can achieve a variety of complex functions. It is also important to note that different versions of Shell programs are not fully compatible, and the differences may be subtle or obvious.

The Shell program, also known as Shell script (script), is based on a series of Shell commands

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