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The git add command adds new or changed files in your working directory to the Git staging area.
git add is an important command – without it, no git commit would ever do anything. git add allows you to shape history without changing how you work.

When do you use git add?

git add README.md
As you’re working, you change and save a file, or multiple files. Then, before you commit, you must git add. This step allows you to choose what you are going to commit.
Commits should be logical, atomic units of change – but not everyone works that way. Maybe you are making changes to files that aren’t logical or atomic units of change. git add allows you to systematically shape your commits and your history anyway.

What Does Git Add Do?

git add [filename] selects that file, and moves it to the staging area, marking it for inclusion in the next commit. You can select all files, a directory, specific files, or even specific parts of a file for staging and commit.
This means if you git add a deleted file, the deletion is staged for commit. The language of “add” when you’re actually “deleting” can be confusing. If you think or use git stage in place of git add, the reality of what is happening may be more clear.
git add and git commit go together hand in hand. They don’t work when they aren’t used together. And, they both work best when used thinking of their joint functionality.

How to Use git add

Common usages and options for git add

git add <path>
  • git add <path>: Stage a specific directory or file
  • git add -A: Stage all files (that are not listed in the .gitignore) in the entire repository
  • git add -p: Interactively stage hunks of changes
You can see all of the many options with git add in git-scm’s documentation.

Examples of git add

Basic Workflow

git add usually fits into the workflow in the following steps:
1

Create a branch

git branch update-readme
2

Checkout to that branch

git checkout update-readme
3

Change a file or files

Make your edits in your text editor or IDE.
4

Save the file or files

Save your changes.
5

Add the files

Add the files or segments of code that should be included in the next commit:
git add README.md
6

Commit the changes

git commit -m "update the README to include links to contributing guide"
7

Push the changes

git push -u origin update-readme

Selective Staging

But, git add could also be used to create multiple commits from your changes:
1

Create and checkout branch

git branch update-readme
git checkout update-readme
2

Make multiple changes

Change several files or make multiple logical changes.
3

Stage first set of changes

Add only one file, or one part of the changed file:
git add README.md
4

Commit first set

git commit -m "update the README to include links to contributing guide"
5

Stage second set of changes

Add another file, or another part of the changed file:
git add CONTRIBUTING.md
6

Commit second set

git commit -m "create the contributing guide"
7

Repeat and push

Repeat as necessary, then push:
git push -u origin update-readme

git add All Files

Staging all available files is a popular, though risky, operation. This can save time, but the risks are two-fold:
Risks of staging all files:
  1. Poorly thought out history - By staging all available changes, the clarity of your history will likely suffer. Being able to shape your history is one of the greatest advantages of using Git.
  2. Accidentally staging and committing files - You may accidentally stage and commit a file. Most common flags don’t add files tracked in the .gitignore file, but any file not listed in the .gitignore file will be staged and committed. This applies to large binary files, and files containing sensitive information like passwords or authentication tokens.

Deciding to stage all files

If the time is right to stage all files, there are several commands that you can choose from:
git add -A
Comparison table:
CommandNew filesModified filesDeleted filesFiles with names beginning with a dotCurrent directoryHigher directories
git add -AYesYesYesYesYesYes
git add .YesYesYesYesYesNo
git add -uNoYesYesYesYesYes

git add A Folder or Specific File

The safest and clearest way to use git add is by designating the specific file or directory to be staged:
git add directory/
  • git add directory/: Stage all changes to all files within a directory titled directory
  • git add README.md: Stage all changes within the README.md file

Undo Added Files

Before undoing a git add, you should first be sure that you won’t lose any work. There’s no way to “revert” an add in the same way you can revert a commit, but you can move the files out of the staging area.
If you have a staged file, and then you make more changes to that file in your working directory, the versions in your working directory and your staging area are different. If you take action to remove the changed version of the file from the staging area, the changes that were in your working directory but not staged will be overwritten.
To avoid this, first stage all changes, then unstage them together, or commit the changes and reset back before the commit happened.

Using git reset to undo git add

git reset is a flexible and powerful command. One of its many use cases is to move changes out of the staging area.
1

Ensure no additional changes

Make sure you don’t have any additional changes to the files in question.
2

Reset the staging area

Use the “mixed” level of reset (the default):
git reset HEAD
# Or explicitly:
git reset --mixed HEAD
This moves staged changes from the staging area to the working directory without affecting committed history.
  • git status: Always a good idea, this command shows you what branch you’re on, what files are in the working or staging directory, and any other important information
  • git checkout [branch-name]: Switches to the specified branch and updates the working directory
  • git commit -m "descriptive message": Records file snapshots permanently in version history
  • git push: Uploads all local branch commits to the remote

Next Steps

Git Commit

Learn how to commit your staged changes

Git Status

Check what files are staged

Git Push

Push your commits to the remote

Git Pull

Update your local branch with remote changes

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