2022.07.11

Class hour 1 git brief introduction

 

The essential difference lies in , After the centralized central server hangs up , Other working computers cannot be used .

And distributed , Even if the central server hangs up , You can also use . 

Class hour 3 Version creation

 

 

 git It can help manage the code under a directory , But you must first execute an initialization command .

  First of all use first mkdir git_test Create a directory .

then cd git_test/ Enter this directory .

use ls -al Check to see that there is almost nothing . 

Use this time git init initialization .

And then you can see .

Initialize empty git The warehouse is located in this directory .

 

Use this time ls -al see , You can see that there is a hidden warehouse here .

Now you can use this repository to manage your code .

 

  Here I was going to use the above two steps to build a version .

As a result, there was a prompt that my information was incomplete .

  At this time, we need to use the commands mentioned here , To enter the user and email .

 

  In this way, the version is created .

So how to view version records ？

use git log That's all right. .

In addition, the yellow font is the serial number of the version .

After re creating a version , Check it again , You will find two version information .

  Class hour 4 Version rollback

When creating a version ,git What did you do ？

The first time you create a version .

At this time, a record will be made , Record that you created a code.txt, And what's inside .

Edit the file again for the second time , Add a line , Another version has been created .

At this time, there will be another record point . This is equivalent to our version 2.

And the recorded points will connect the versions into a line .

Note that it is not a complete copy , Just record the difference between you and the previous version .

that , If later I feel that the version 1 better , Want to return the version 1 What if ？

In the newly created version , There's a pointer , Will point to the latest version .

This pointer is called head.

So in the previous version , You can use it The following figure shows . 

 

Back to a certain version , Directly use this pointer to command .

 

If you want to go back to version 2 Words , Copy version 2 The serial number of , Then use the command .

 

  So if you can't see the version serial number , How about ？

We can find it by checking our own operation records .

 

The yellow font at the front of the record , It is the content of the version serial number .

So you can know the serial number , And use the method just now to return to the version .

Pay attention to , There must be two steps to create ！！！