まさにシェルがなにかついて記述されている

https://en.wikipedia.org/wiki/Shell_script

Typical operations performed by shell scripts include file manipulation, program execution, and printing text.
A script which sets up the environment, runs the program, and does any necessary cleanup, logging, etc. is called a wrapper.

The term is also used more generally to mean the automated mode of running an operating system shell;
in specific operating systems they are called other things such as 

 batch files (MSDos−Win95 stream, OS/2), 
 command procedures (VMS), 
 and shell scripts (Windows NT stream and third−party derivatives like 4NT?article is at cmd.exe),
 and mainframe operating systems

are associated with a number of terms.


バカの世界では違うらしい