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How to Use .gitignore: A Step-by-Step Guide

How to Use .gitignore: A Step-by-Step Guide
Shahid Ali
Technical writer
Git
19.09.2024
Reading time: 5 min

In Git, the .gitignore file is an essential tool that helps you manage which files and directories are included in your version control repository. By using .gitignore, developers can prevent unnecessary files from being tracked, such as log files, dependencies, or system-specific files. This guide will walk through how to create and use a .gitignore file efficiently.

The .gitignore file tells Git which files or directories to ignore in a project. It allows developers to exclude files that are not necessary for the project, helping to maintain a cleaner and more efficient version control history. 

Why Use .gitignore?

  • Avoid Clutter: Prevent large or unnecessary files from cluttering your repository.

  • Privacy: Keep sensitive information such as API keys, credentials, or configuration files out of version control.

  • Efficiency: Streamline collaboration by ensuring only essential files are tracked and shared.

Creating a .gitignore File

Creating a .gitignore file is simple. 

1. Navigate to your Git repository.

Open your terminal and navigate to the root directory of your Git project.

cd /path/to/your/git/project

2. Create the .gitignore file.

You can create the file using the following command:

touch .gitignore

3. Open and edit the .gitignore file.

Open the .gitignore file in your text editor and add the files or directories you want Git to ignore. For example:

# Ignore node_modules folder
node_modules/

# Ignore log files
*.log

# Ignore .env files
.env

4. Save and commit the changes.

After editing, save the .gitignore file and commit the changes to Git.

git add .gitignore
git commit -m "Add .gitignore"

Common Patterns in .gitignore

There are several common patterns used in .gitignore files to specify files or directories for exclusion. Below are some examples of commonly used patterns.

Ignoring Files by Extension:

*.log   # Ignore all log files
*.tmp  # Ignore all temporary files
*.swp  # Ignore swap files created by text editors

Ignoring Specific Directories:

/logs/   # Ignore the logs directory
/temp/   # Ignore the temp directory

Ignoring Hidden Files:

.*   # Ignore all hidden files starting with a dot (e.g., .DS_Store)

Ignoring Files in a Specific Folder:

/docs/*.pdf   # Ignore all PDF files inside the docs folder

Negating a Pattern (Include Files that were Previously Excluded):

*.pdf    # Ignore all PDF files
!resume.pdf # Do not ignore resume.pdf

Ignoring Files Globally vs Locally

While .gitignore is usually created at the root of your repository, you can also configure Git to ignore files globally, which applies to all repositories on your machine.

Ignoring Files Locally

If you want to exclude files only in your current repository, simply edit the .gitignore file within that project. This will ensure the exclusion applies only to this repository.

Ignoring Files Globally

To create a global .gitignore file, which applies across all your repositories, follow these steps:

1. Create a global .gitignore file:

touch ~/.gitignore_global

2. Add patterns to the global .gitignore:

Edit the file and include patterns for files you want to ignore globally. For example:

*.log
*.tmp
.DS_Store

3. Configure Git to use the global .gitignore:

git config --global core.excludesfile ~/.gitignore_global

Best Practices for Using .gitignore

To make the most of .gitignore, follow these best practices:

  • Add a .gitignore early

Create a .gitignore file as soon as you start a project to prevent unnecessary files from being tracked.

  • Keep it organized

Organize your .gitignore by grouping related patterns together and adding comments. For example:

# OS generated files
.DS_Store
Thumbs.db

# Node.js dependencies
node_modules/
  • Do not commit sensitive information

Use .gitignore to ensure private files like API keys and configuration settings are not accidentally committed to version control.

  • Test your .gitignore

Use git status to check if your .gitignore file is properly excluding files. If a file is still being tracked, it might have been added to the repository before it was ignored.

Troubleshooting .gitignore Issues

Sometimes, files that should be ignored are still being tracked. Below are some common reasons and solutions for .gitignore issues.

Files Already Tracked

If a file was added to the repository before being added to .gitignore, it will continue to be tracked by Git. To stop tracking the file:

1. Remove the file from Git but keep it locally:

git rm --cached filename

2. Add the file to .gitignore.

3. Commit the updated .gitignore and removal of the cached file.

git commit -m "Update .gitignore and remove cached files"

Case Sensitivity Issues

Git is case-sensitive, so ensure that the patterns in your .gitignore file match the case of the filenames.

For example:

file.txt # Ignores file.txt but not File.txt

Testing with git check-ignore

To test if a file is being ignored correctly, you can use the git check-ignore command:

git check-ignore -v filename

This command shows the rule responsible for ignoring a particular file.

Conclusion

By effectively using .gitignore, you can manage which files are included in your Git repository and ensure that only essential files are tracked. Follow the steps in this guide to create, customize, and troubleshoot your .gitignore file for efficient version control management.

Git
19.09.2024
Reading time: 5 min

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24 March 2025 · 6 min to read

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