Git Interview Questions and Answer Part – 7

How to Compute object ID and optionally creates a blob from a file?

• git hash-object (Ans)
• git cat-file
• git update-ref
• git count-objects

How to Update the object name stored in a ref safely?

• git hash-object
• git cat-file
• git update-ref (Ans)
• git count-objects

Which commands will Reference logs or record when the tips of branches and other references were updated in the local repository.

• git log
• git reflog (Ans)
• git update-ref
• git count-objects

git stores different types of objects in .git/objects. Which is wrong objecst type?

• commit
• tree
• blob
• parent (Ans)

How to show the contents of the hashed files in .git/objects?

• git show
• git reflog
• git log
• git cat-file (Ans)

How to shows us the type of the object represented by a particular hash?

• git cat-file -t (Ans)
• git cat-file -p
• git cat-file -k
• git cat-file -type

How does “git rebase” move an existing commit?

• It just changes the parent in the commit file.
• It changes the commit’s parent and its SHA-
• None of these
• It copies over the commit to a new commit with a different parent and SHA- (Ans)

What happens to unreachable objects in the database?

• They immediately get deleted.
• You can never make an object unreachable in Git.
• They stay there forever, in case you want to retrieve them.
• They can eventually get garbage-collecte- (Ans)

What’s a “pull”?

• A “merge” followed by a “push”
• A “push” followed by a “merge”
• A “fetch” followed by a “push”
• A “fetch” followed by a “merge” (Ans)

Can an object in Git be safely modified?

• No: you might get the same SHA1 as another object.
• No: if you changed even one bit, then you’d get a different object with its own SHA- (Ans)
• Yes: you can edit the content of the file that stores the object.
• Yes: you can ask Git to generate a new SHA1 for the object.

What are the four types of objects in the Git database?

• Blobs, Trees, Commits and Versions
• Files, Directories, Commits and Tags
• Blobs, Trees, Commits and Annotated Tags (Ans)
• Blobs, Trees, Commits and Branches

What happens when you commit?

• The current branch changes, HEAD doesn’t. (Ans)
• HEAD changes, the current branch doesn’t.
• Neither HEAD nor the current branch change.
• Both HEAD and the current branch change.

Which objects are created when you merge?

• Zero or one commit and nothing else
• Merges don’t create new objects.
• Zero or one commit, and possibly new trees and blobs (Ans)
• Exactly one commit and nothing else

Where can HEAD point?

• To a branch, a commit, a tree, or a blob
• To a branch
• To a branch or a commit (Ans)
• To a branch or nowhere

Which of these is not a Git command?

• git clone
• git fork (Ans)
• git push
• git fetch

Which objects in Git have a SHA1 hash?

• Only Blobs and Trees
• Each object in the database (Ans)
• Each object in the database, and the same object can have multiple SHA1 hashes
• Only Commits

Can an object in Git be safely modified?

• No: if you changed even one bit, then you’d get a different object with its own SHA1. (Ans)
• Yes: you can edit the content of the file that stores the object.
• Yes: you can ask Git to generate a new SHA1 for the object.
• No: you might get the same SHA1 as another object

Where does Git store the names of files and directories?

• In the object database, inside the trees that point to the objects (Ans)
• In the object database, inside the blobs and trees that store files and directories
• Nowhere
• In the “.git/links” subdirectory

What happens when you commit?

• Both HEAD and the current branch change.
• Neither HEAD nor the current branch change.
• HEAD changes, the current branch doesn’t.
• The current branch changes, HEAD doesn’t. (Ans)

Which objects are created when you merge?

• Merges don’t create new objects.
• Exactly one commit and nothing else
• Zero or one commit and nothing else
• Zero or one commit, and possibly new trees and blobs (Ans)

Rajesh Kumar

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