How to restore the previous version in git

How to restore the previous version with git

Git is an open source distributed version control system that can manage historical versions of code for programmers. When we want to go back to a previous version of our code, Git makes it easy for us to revert to a previous version. Next, we'll cover how to restore a previous version in Git.

Step one: View version history

In Git, we can use the git log command to view version history. This command will list all commit records from the most recent to the farthest, each record has a unique SHA value. We can use the SHA value to determine which version to restore to.

Use command:

$ git log

After executing the above command, Git will output a log record similar to the following:

commit 4634cd01b2e831942d87d321c1f34c67d04e25a2 (HEAD -> master)
Author: Tom <tom@example.com>
Date:   Mon Jun 1 15:11:22 2020 +0800

    Updated readme file

commit 4f3d4e8d43a1df45a41e721fd33b9fefa9cc196c
Author: Tom <tom@example.com>
Date:   Sun May 31 11:08:38 2020 +0800

    Added documentation files

commit 1514e158c6dbf2a1f11a27283864d1f0fcf37dc3
Author: Tom <tom@example.com>
Date:   Sat May 30 17:27:19 2020 +0800

    Initial commit

In this example, we are on June 1, 2020 The readme file has been updated, and we want to restore the code to the version before the update, which is the commit 4f3d4e8d43a1df45a41e721fd33b9fefa9cc196c version.

Step 2: Restore to the previous version

In Git, we can use the git checkout command to restore to the previous version. We can use git checkout plus the SHA value of the version to be restored, as shown below:

$ git checkout 4f3d4e8d43a1df45a41e721fd33b9fefa9cc196c

After running this command, Git will restore our code to the specified version. Note that this will lose changes we made in subsequent commits. If we want to undo the revert, we can run the following command:

$ git checkout master

This will return Git to our latest commit and revert any changes we made since then.

Step 3: Submit the restored code

If we are satisfied with the restored code, we need to submit this version. Modifications can be committed using the following command:

$ git add .
$ git commit -m "Reverted to previous version"

The above code will add all changes to the staging area, and then we can commit this version with the commit message "Reverted to previous version".

Conclusion

Restoring code in Git is very simple. You can view the version history, use the git checkout command to restore to the previous version, and then commit the changes. This open version control system can provide developers with a more flexible code management method. However, please also note that the restored version will lose certain historical data, so please use it with caution.

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