The shell is born in Unix, it is a tool to interact with unix/linux, it is meaningless to learn the shell alone, please refer to the Unix/linux Getting Started tutorial to understand Unix/lunix Foundation.
In recent years, the shell has been neglected, a scripting language that is not valued. The Shell is Unix's first scripting language, but it's pretty good. It combines ductility and efficiency, continues to retain its unique features, and is constantly being refined to keep up with the many scripting languages that have been tricks for years.
The shell needs to rely on other programs to do most of the work, which may be its flaw, but its undoubted strength is that it is a concise scripting language tag and is faster and more efficient than programs written in C.
The C language network explains Shell programming in an easy-to-understand language, allowing you to quickly master the shell in the shortest possible time and write practical programs and code.
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Introduction to Linux shell scripts