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The command git checkoutis used to update the repository to a specific point in the project's history. When we pass it a branch name, it switches to the branch we want to be currently at.

This command is also used to undo git addthe command. git checkoutThe command does not change the working directory. It only updates the index file and repository of the current project.

git checkoutcommand can also be used to recover files or directories that were accidentally deleted using certain git commands. It can also be used to undo a git move to another folder command.

Undoing a checkout in Git

For undoing, first, we will execute the below mentioned command to checkout a particular branch; in our case, we are checking out masterthe branch.

git checkout master 

If we are not masteron the branch, then we will use the name of that branch instead of mentioning master. If it does not work, we will try the below mentioned commands on a single file in the repository.

git checkout HEAD /path/to/file 

What if we want to do it for the entire repository working copy? We will run the following command to do this.

git reset --hard HEAD

If the above mentioned command also doesn't work, we will look for our old head SHA in the reflog and will reset to the following configuration.

git reflog git reset --hard <sha from reflog>

HEADcan be called as a name that always points to the most recent commit in our current branch.

If we're not on the same branch, use the same name as our branch HEAD. Or, if we're on the wrong branch, use the name of the branch we intended to be on instead of HEAD.

In other words, HEADit is the name of the latest commit in the branch we are currently working on that is already checked out.

git reset --hard HEAD

We can also use the name of a different branch if we want to reset to checkout or reverse the effects of a bad command from another branch.

Tip: A reflog is like a log of all the SHA-1 values ​​of all the commits we have made so far. We can sometimes use these SHA-1 values ​​to find the SHA-1 value of an older commit that we moved out of in the last commit.

Tip: If we are on the wrong branch and we want to get back to the branch we were on previously, we can do so using the following Git command:

git checkout <branch we want to switch to