The core of bash

linux in linux shell is kernel, which is used to manage linux hardware. Our general user (user) communicates with the kernel by shell.
Basically, the hardware is working for us, and the hardware is the "core". Again, our users use the "Shell" control
"Utility" to control the hardware for our correct work. Further, since the kernel listens to
does not understand the human language, and humans have no way to directly remember the language of the kernel, so the communication between the two must be supported by the shell!
(In fact, the early DOS text interface is also using the shell to communicate! The name of the shell is called command.com, also remember
得? ^_^)