Can anyone elaborate on the shell in Linux

It is equivalent to the command line in Windows, but because Linux has developed for so many years, everyone works under the shell, so there are countless powerful tools under the shell, such as sed, such as awk, etc., so the basic learning of shell is these tools, and then use the shell to establish logic to link these tools, which can complete all the text processing problems you can imagine.

What is a shell

The shell is the interface between the user and the Linux operating system. There are several shells in Linux, and the default one is Bash. This chapter describes how shells work, the types of shells, the general operation of shells, and the characteristics of bash.

The shell of the Linux system serves as the shell of the operating system and provides users with an interface to use the operating system. It is a collective term for command language, command model group interpretation program, and programming language.

Shell is a command language interpreter that has its own built-in shell command set, and the shell can also be called by other applications in the system. The commands entered by the user at the prompt are first interpreted by the shell and then passed to the Linux kernel.

A shell is a Linux command, and a shell program is simply a file that contains several lines of shell or Linux commands.

Shell is a general term for the Linux command set, which is a human-machine interface that belongs to the command line.

Translated as shell, it is wrapped around the outer layer of the Linux kernel, a human-machine interface that can issue relevant instructions to the operating system through a series of Linux commands. The shell can combine a series of Linux commands through its conditional statements and loop statements to form a program, which is equivalent to a process-oriented program, shell script, to achieve some more complex functions.

is a program written in C language, which is a bridge for users to use Linux. By definition, a shell is the equivalent of a decorated command line, and like the command line, it can operate Linux. However, the shell is process-oriented, which is equivalent to having certain logic and procedures, while the command line is just a single operation.

Some commands can be executed repeatedly. You can also write your own commands that you want to repeat into a script. On the command line, you need to input commands one by one, which is relatively cumbersome.

Version: bash: is the bourne again shell of gnu, which is the default shell on the GNU operating system.

Korn Shell: is a development of the Bourne Shell, and is compatible with the Bourne Shell in most respects.

C Shell: is the BSD version of Sun's shell.

z shell：the last shell you’ll ever need!z is the last letter, which is the ultimate shell.

It integrates the important features of BASH and KSH, and at the same time adds its own unique features.