Basic operation and instruction of GIT

Time:2021-1-12

basic operation

1、 Basic operation command

  1. Create an empty folder
  2. Right click and click git bash here to start the command line (MAC opens the terminal in the current folder)
  3. git initWarehouse initialization
  4. Create an initialization file index.html
  5. git add index.htmlAdd files to the staging area
  6. Git commit - M 'comment'Submit to warehouse m is short for message

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2、 . git directory

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  • Hooks directory contains client or server hook scripts, which are executed automatically under specific operations.
  • Info contains a global exclusion file that can be ignored by the configuration file
  • Logs saves log information
  • The objects directory stores all the data content, and the local version inventory is put in the location
  • The refs directory stores a pointer (Branch) to the submitted object of the data
  • The config file contains project specific configuration options
  • Description is used to display the description of the warehouse
  • The head file indicates which branch is currently checked out
  • Index buffer data
  • Remember: don’t modify the contents of the. Git folder manually*

3、 Three areas of the repository

  • Workspace (code editing area): represents the place where code is developed locally
  • Temporary storage area (modify to be submitted area): the address representing the temporary storage code of the local warehouse
  • Warehouse area (code saving area): represents that the code enters local version control

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Common commands

1、 Common commands

git statusVersion status view

Red: the document is in the workspace

Green: the document is in the staging area

It is not reflected. The description is in the version area

git add -AAdd all new files to the staging area (orgit add . git add *

usegit restoreChanges to the workspace can be discarded

Git commit - M 'comment'Submit modification and comment

useGit restore -- staged < File >Temporary storage can be cancelled

git diffView the differences between the workspace and the staging area (do not show deleted or new files) to show what changes have been made

//Interpreting the results
lipeihuadeMacBook-Pro% git diff
 //In comparison, index.html (before change) index.html (i.e. after the change). 
 diff --git a/index.html b/index.html
 //Represents the GIT hash value of two versions
 index 16158b4..61045cd 100644
 //"---" indicates the version before the change
 --- a/index.html
 //"+ +" indicates the changed version
 +++ b/index.html
 //Line 1-2 of the source file is different from line 1-5 of the target file;
 @@ -1,2 +1,5 @@
 //-The red part indicates the reduced part and the + green part indicates the increased part
 index.html 
 -no 1
 +
 +
 +
 +Revise again
 //\No newline at end of file
 \ No newline at end of file

git diff --cachedView differences between staging area and warehouse

2、 Historical version rollback

2.1 view historical version

git log

By default, without any parameters, GIT log will list all the updates according to the submission time, and the latest updates are at the top. Each update has a SHA-1 check sum, author’s name and email address, submission time, and finally a paragraph indented to show the submission instructions.

git log –oneline

If the content is too much, you need to use the direction keys to scroll up and down, pressqsign out

git logThe command has an option to change how warehouse information is displayed. This option is--oneline.

Each line displays a commit. The first seven characters of Sha display the commit message

2.2 roll back according to version number

Version rollback, local only. It doesn’t affect the content of GIT library.

git reset –hard b815fd5a6ae655b521a31a9

For version rollback, you don’t need to use the complete hash string, just the first seven digits

Before version switching, submit the current code status to the warehouse

git reflog

If you want to go back to the previous version after rollback, GIT reflog can view all operation records of all branches (including commit and reset operations), including the deleted commit records. Git log cannot view the deleted commit records

2.3 other rollbacks (understanding)

Git reset -- hard head ^ rollback to previous version
Git reset -- hard head ^ rollback to previous version
Git reset -- hard head ~ 100 roll back to before 100 versions

Configuration ignore file

1、 The file was not submitted in the warehouse

Some files in the project do not need to enter the version library, such as the configuration of the editor. A file needs to be created in GIT. gitignore is the same level directory as. Gitignore.

#Ignore all. Idea folders
.idea
#Ignore all files ending in. Test
*.test
#Ignore node_ Modules files and folders
/node_modules

2、 The file has been submitted in the warehouse

For a file that has been added to the version library, you can delete the file in the version library


git rm --cached .idea
git rm --cached ./css/go.css

Then configure ignore in. Gitignore


.idea
/css/go.css

Just submit add and commit

branch

Branching is one of the important features of GIT. Developers can separate new development lines on the basis of main development lines.

Create branch

Name is the name of the branch

git branch name  

View branches

git branch

Switch branches

git checkout name

Merge branches

git merge name

Delete branch

git branch -d name

Switch and create branches

git checkout -b name

Note: submit the current branch before switching branches

conflict

When multiple branches modify the same file, there will be conflicts when merging branches. The solution to the conflict is very simple. Modify the content to the desired result, and then continue to execute git add and git commit.

Here is the article about the basic operation and instruction of GIT. For more information about the basic operation and instruction of GIT, please search previous articles of developer or continue to browse the following articles. I hope you can support developer more in the future!