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What is git --amend?

Theodore Kelechukwu Onyejiaku

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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The git --amend command can be used to modify the last commit. Once it has modified the last commit, it replaces it with a new commit.

How to use git --amend

git commit --amend -m "commit message"

We use the -m option with the commit message to pass a new message from the command line, similar to how we use git --commit.

Example

Let’s create a file and initialize it with git.

On your terminal, create a folder called dummy by using the mkdir command as shown below.

mkdir dummy

Change your directory to dummy folder by using cd command and then create a new file with the touch command as shown below.

cd dummy
touch dummy.txt

Initialize the dummy folder with the git command as shown below.

git init

Stage the dummy file with the git add command as shown below.

git add dummy.txt

Now make the first commit.

git commit -m "first commit"

To see the commit history, we type in the log command as shown below.

git log --oneline

The output of the git log --oneline command is shown below.

Add some dummy text to the dummy.txt file and commit the changes.

git add dummy.txt
git commit -m "add dummy text to dummy.txt file"

Check the commit history in the image below.

Now, let’s modify the last commit with git --amend.

 git commit --amend -m "ammend last commit"

Finally, let’s find out if this new commit has replaced the last commit by using the git log command.

With git --amend we were able to modify the last commit and replace it with the modified one.

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CONTRIBUTOR

Theodore Kelechukwu Onyejiaku

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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