Shell command and operation principle

        uu When using computers , Have you ever thought about how we operate computers ？ Are we a direct operating system ？

         image Linux、Windows, Strictly speaking, they are all operating systems , That's what we often say ‘ The core ’. By listening to the name, we know that we can't operate it directly , Because let's operate the operating system directly Cost is very high , And people will Make a mistake Of . Then how can we use the operating system ？

        Next I will introduce shell command , To answer the above questions

What is? shell？

         To put it bluntly , We use graphical interface or command line as shell program , That is to say shell.

shell The function of ？

        shell The official translation of is command line interpreter , Its function ：

• Translate the user's commands to the core processing .
• meanwhile , Translate the core processing results to users .

         Then the answer to the above question comes out —— We are shell Shell program to interact with the operating system , commonly Windows The shell program of is a graphical interface ,Linux The shell of is the command line ~

         We do not operate the operating system directly , Want to make the computer run , Follow the operation in the figure below ~

          Hardware and hardware drivers are , If we turn on the computer , There may be no response when operating the connected mouse or keyboard immediately , That is to say, the driver is not ready ~

         Get back to business ：shell Commands are the medium that helps us interact with the operating system efficiently , And to a certain extent, it can protect the operating system （ After all, the genuine operating system costs money ）~

         The most vivid example is ,shell The function of command is similar to that of matchmaker when two people are on a blind date ~

         That's all ~