What is a Linux shell

Shell Concept :

The shell is a command-line interpreter that provides users with an interface system-level program that sends a request to the Linux kernel to run the program, and the user can start with the shell, suspend, stop, or even write some programs.

The shell is also a powerful programming language, and the shell is the scripting language that interprets execution, and the Linux command can be called directly in the shell.

2.shell classification

3. View the shell used by the current system

Echo $SHELL

4. View Linux-supported shells

Vi/etc/shells

What is a Linux shell