Git Tutorial

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  1. Git Tutorial

This tutorial is designed to introduce newcomers to the basics of Git, a distributed version control system. Git is essential for collaborative software development and managing changes to files over time. This guide will cover installation, basic commands, and fundamental concepts.

What is Git?

Git is a system that tracks changes to files. It allows you to revert to previous versions, branch out to experiment with new features, and merge changes from multiple contributors. Unlike centralized version control systems, Git is *distributed*, meaning every developer has a complete copy of the project history. This offers redundancy and allows for offline work. Understanding Version Control Systems is crucial for any software project.

Installation

The installation process varies depending on your operating system. Here's a breakdown:

Operating System Installation Command
Linux (Debian/Ubuntu) `sudo apt-get update && sudo apt-get install git`
Linux (Fedora/CentOS) `sudo yum install git`
macOS `brew install git` (Requires Homebrew)
Windows Download and install from [[1]]

After installation, verify it by running `git --version` in your terminal. You may need to configure your Git username and email address using `git config --global user.name "Your Name"` and `git config --global user.email "[email protected]"`. See the Git Configuration page for more details.

Basic Git Commands

Here’s a look at the most common Git commands. Understanding these is the foundation for using Git effectively.

  • `git init`: Initializes a new Git repository.
  • `git clone <repository_url>`: Copies a remote repository to your local machine. This is the primary way to start working on an existing project.
  • `git add <file>`: Stages a file for commit. This tells Git you want to include the changes in the next snapshot. You can use `git add .` to stage all changed files.
  • `git commit -m "Commit message"`: Saves the staged changes to the repository with a descriptive message. Commit messages should be concise and explain *why* the changes were made. Read about Effective Commit Messages.
  • `git status`: Shows the status of your working directory and staging area.
  • `git log`: Displays the commit history.
  • `git push`: Uploads your local commits to a remote repository.
  • `git pull`: Downloads changes from a remote repository and merges them into your local branch.
  • `git branch`: Lists, creates, or deletes branches.
  • `git checkout <branch_name>`: Switches to a different branch.
  • `git merge <branch_name>`: Merges changes from another branch into your current branch.

Core Concepts

Let's explore some key Git concepts.

  • Repository: A collection of files and the history of changes to those files. Repositories can be local (on your machine) or remote (hosted on a server like GitHub, GitLab, or Bitbucket).
  • Commit: A snapshot of your files at a specific point in time. Each commit has a unique identifier (SHA-1 hash).
  • Branch: A pointer to a specific commit. Branches allow you to work on different features or bug fixes in isolation.
  • Merge: The process of combining changes from one branch into another.
  • Staging Area: An intermediate area where you prepare changes for commit.
  • Working Directory: The files you see and edit on your computer.

Branching and Merging

Branching is a powerful feature of Git. It allows you to work on new features or bug fixes without affecting the main codebase.

Command Description
`git branch feature-x` Creates a new branch named "feature-x".
`git checkout feature-x` Switches to the "feature-x" branch.
`git add .` Stages all changes in the current branch.
`git commit -m "Implement feature x"` Commits the changes to the "feature-x" branch.
`git checkout main` Switches back to the "main" branch.
`git merge feature-x` Merges the changes from "feature-x" into the "main" branch.

Conflicts can arise during merging if the same lines of code have been modified in both branches. Git will mark these conflicts, and you'll need to manually resolve them before committing the merge. Refer to the Conflict Resolution documentation for help.

Remote Repositories

Remote repositories are hosted on servers and allow for collaboration.

Command Description
`git remote add origin <repository_url>` Adds a remote repository named "origin".
`git push origin main` Pushes your local "main" branch to the "origin" remote.
`git pull origin main` Pulls changes from the "origin" remote's "main" branch.
`git remote -v` Lists the configured remote repositories.

'Origin' is a common name for the primary remote repository. Understanding Remote Branching Strategies is vital for large projects.

Advanced Concepts

Once you’re comfortable with the basics, explore these advanced Git features:

  • Rebasing: An alternative to merging that rewrites the commit history.
  • Stashing: Temporarily saves changes that you don't want to commit immediately.
  • Tagging: Creates a permanent label for a specific commit.
  • Ignoring Files: Using a `.gitignore` file to exclude certain files from version control. See the .gitignore file documentation
  • Submodules: Including another Git repository as a subdirectory within your project.

Resources


Git Version Control GitHub GitLab Bitbucket Command Line Interface Software Development Repository Management Branching Strategy Merge Conflicts Git Configuration Effective Commit Messages Conflict Resolution Remote Branching Strategies .gitignore file Submodules Homebrew Version Control Systems


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