What's a shell and what is Bash?

Often heard: Shell programming, bash programming, and bash shell programming, what is the shell, and what is bash, what are the links between the two ...

bourne shell is the shell used by the early Unix system, located in/bin/sh, or SH, which is the shell's embodiment. It can be understood that the shell is an object, and that the Bourne shell is only an instance of the object.

sh is not only a command interpreter, but also a programming language, which can combine various commands and logic to form new commands. And SH has become the de facto standard for all subsequent shells, and the shell on the Unix-like system is compatible with the Bourne shell.

bash (Bourne-again Shell) is also a shell, with the greatest degree of compatibility with SH, and introduces some practical features from Korn Shell Ksh and C shell csh. More powerful in terms of interactivity, and programmability than Sh.

> Now the previous statement is clear:

shell programming is the use of a shell (possibly bash) for programming, as in programming language programming, and ultimately a language to choose.

bash programming refers to programming with Bash (the shell), as in Python (programming language).

Bash shell programming is a "bash programming" wordy statement.

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What's a shell and what is Bash?