How to restore deleted branches in git

Git is a very practical version control tool that makes it very convenient to manage code changes. However, when using Git, you will inevitably encounter some problems. Among them, deleting branches is a common problem.

Suppose you accidentally deleted a branch in the project, what would you do? Don't panic, Git provides an easy way to restore a deleted branch.

1. Understand the garbage collection mechanism of Git

In Git, when you delete a branch, it is not actually deleted, it is just marked as "deleted" by Git. delete". This is because Git has a garbage collection mechanism that regularly cleans up unwanted objects, including branches marked as "deleted."

2. Use the Git reflog command

The Git reflog command can list the history of all Git references (such as branches, tags, etc.), including references that have been deleted. Therefore, use the Git reflog command to find a previously deleted branch and restore it.

The specific steps are as follows:

1. Enter your Git warehouse directory and open a terminal (MacOS or Linux) or Git Shell (Windows).
2. In the terminal or Git Shell, enter the following command to view the reference history:

git reflog

3. Find the last commit ID of the branch you deleted, and check the reference history You can see information similar to the following:

8a79c3f HEAD@{1}: commit: add feature A
b3a0a50 HEAD@{2}: commit: add feature B
2abe147 HEAD@{3}: branch: add-feature-C

Among them, "HEAD@{n}" indicates the nth reference operation, "commit:" indicates that the type of the reference operation is a commit operation, " "add feature A" indicates the commit message corresponding to the commit operation.

4. Then, use the following command to restore the branch:

git branch <branch-name> <commit-ID>

Among them, "" is the branch name you want to restore, you can customize one The new branch name; "" is the ID of the last commit found in the previous step.

5. Finally, use the following command to switch to the restored branch:

git checkout <branch-name>

Now, you have successfully restored the branch that was accidentally deleted.

Summary

Through the Git reflog command, we can find the branch that was accidentally deleted and restore it. This method requires us to manually find the last deleted commit ID and create a new branch based on this. Therefore, when using Git, we should always pay attention to the backup and management of files and branches to avoid unnecessary losses caused by misoperation.

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