git retract the newly deleted branch

In the daily use of git for version control, we may accidentally delete a branch. However, don't panic too much, git provides a function to help us withdraw the newly deleted branch.

1. Basic Concepts

Before we delve into how to withdraw the newly deleted branch, we first need to understand some basic concepts and terminology in git.

1. Branch: A branch is a copy of the code warehouse. The code can be modified in this copy without affecting the code in the master branch. We can add and modify code on a branch and then merge it into the main branch after development is complete.
2. Commit: Every time we modify the code, git will save the changes as a commit. By committing, we can easily review and roll back changes.
3. Head pointer: The head pointer is the commit node pointed by the current branch. When we make code modifications on a branch, git will automatically update the head pointer to point to the latest commit.
4. Undo (revert): Undoing refers to canceling the previous submission in the history. In other words, we can roll back code changes through undo.

2. How to withdraw the newly deleted branch

Sometimes, we accidentally delete a branch when using git. If we simply delete the branch without doing anything else, we can easily undo the deletion.

1. Find the branch

First, you need to know the name of the branch that was just deleted. You can find it with the following command:

$ git log --oneline --abbrev-commit --graph --decorate

This command will display the commit history in the code repository. In the output content, you will see the hash value, submission information, branch information, etc. of each submission.

2. Restore branch

Now that we have the name of the branch that was just deleted, we can restore the branch using the following command:

$ git branch <branch-name> <commit-hash>

Where, "branch- name" is the name of the branch that needs to be restored, and "commit-hash" is the hash value of the commit node that needs to be restored ("HEAD" can also be used instead).

Once restored, you can continue developing on this branch as usual.

Note: If the branch you just deleted is not the latest commit, you need to move the HEAD pointer to the correct commit node before restoring the branch. You can use the following command to find the correct commit node.

$ git reflog

This command will display the git operation history of the code repository and you can find the correct submission node.

3. Summary

When using git on a daily basis, accidentally deleting a branch is not a big problem. As long as we master the relevant operations, we can easily undo the deletion operation. During the subsequent development process, remember to carefully review every operation to ensure that you do not accidentally delete branches or other important Git resources.

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