What does the shell command mean?

Shell command refers to a set of commands provided by the operating system shell, which is used to control and manage the computer system. Shell is a command interpreter, and various operations such as file operation, process management and user management can be realized by using shell commands. Different operating systems will provide different shell commands, such as cmd command of Windows system and bash command of Linux system.

Shell commands can be executed through a command line interface or a batch program. Enter the corresponding command in the command line, and then press Enter to perform the corresponding operation. Through batch processing program, you can put a set of commands in a file and then run it once, thus improving efficiency. At the same time, you can also save the command line commands as batch files for future use.

Shell commands can not only be run directly, but also be combined with pipeline, redirection and other technologies to achieve richer functions. The pipeline can take the output of one command as the input of another command, thus realizing the combination of multiple commands; Redirect can redirect the input and output of a command to a file, or read the input from a file. Mastering these technologies will enable us to manage and operate computer systems more effectively.