How to delete a version in Git

In the process of using Git for code management, it is often necessary to delete a certain version. This may be because a version contains sensitive information, or because code that no longer works needs to be removed. In this article, we will discuss how to delete versions in Git.

First, let’s be clear: every commit in Git has its own unique SHA-1 hash. Therefore, before deleting a version, you must first obtain the hash of that version. You can use the git log command to view the commit history and find the hash of the version you want to delete.

For example, suppose we want to delete the version with SHA-1 hash value abcd1234. After this, we can use the following two methods to delete the version.

Method 1: Use the Git Revert command

Use the Git Revert command to create a new submission to roll back the previous submission and delete it. To roll back to the commit with hash abcd1234, you can use the following command:

git revert abcd1234

This command will create a new commit that will undo all the changes made in the commit with hash abcd1234 Change. The advantage of this method of deleting a version is that it will not affect the submission history and can be easily reversed.

Method 2: Use the Git Reset command

Suppose we want to completely delete the version with hash value abcd1234, including all its previous commits. Well, we can use the Git Reset command. This command will reset the HEAD pointer of the current branch and point it to the commit with hash value abcd1234. After this, you can use the following command to move the branch pointer to the new commit:

git reset --hard abcd1234

It should be noted that this operation will completely delete the commit and all subsequent commits from Git history, so Exercise caution. Unless you are sure you have backed up all your data, this command may cause irreversible data loss.

Summary

In Git, you can use the Git Revert command or the Git Reset command to delete a version. Git Revert is used to create a new commit to undo a previous commit. Its advantage is that the undo can be easily undone without adversely affecting the commit history. However, it does not delete the original commit from Git history. The Git Reset command can permanently delete one or more commits. This approach requires extreme caution as it resets the entire commit in Git history to the specified hash. This operation is irreversible and requires careful thought and backup of all data.

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