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How to Install and Configure Git on Ubuntu 22.04

How to Install and Configure Git on Ubuntu 22.04
Adnene Mabrouk
Technical writer
Git Ubuntu
22.07.2024
Reading time: 3 min

Git is a widely-used version control system that allows developers to track changes in their code and collaborate with others. Whether you are working on a personal project or contributing to open-source repositories, Git is an essential tool in your development toolkit. This guide will walk you through the process of installing and configuring Git on Ubuntu 22.04, ensuring you are ready to manage your code efficiently.

Prerequisites

Before you begin, ensure you have the following:

  • A system, such as a cloud server, running Ubuntu 22.04.

  • A user account with sudo privileges.

  • Basic knowledge of the Linux command line.

Installing Git

Update the Package List

First, update the package list to ensure you have the latest information about available packages and their dependencies. Open your terminal and run:

sudo apt update

Install Git

To install Git, execute the following command:

sudo apt install git

This command downloads and installs Git from the Ubuntu repositories.

Verify Git Installation

After the installation is complete, verify that Git is installed correctly by checking its version with git command:

git --version

You should see output similar to this:

Image1

Basic Git Configuration

Configure Git with your personal information

Configuring Git with your personal information is crucial for keeping track of changes and collaborating with others. Set your global username and email address with these commands:

git config --global user.name "Your Name"
git config --global user.email "[email protected]"

You can view your configuration settings with:

git config --list

Image2

Generating SSH Keys for GitHub/GitLab

To securely connect to GitHub or GitLab, generate an SSH key pair:

ssh-keygen -t ed25519 -C "[email protected]"

Follow the prompts to save the key to the default location (~/.ssh/id_ed25519) and create a passphrase for added security.

Add your SSH key to the SSH agent:

eval "$(ssh-agent -s)"
ssh-add ~/.ssh/id_ed25519

Next, copy your SSH key to the clipboard:

cat ~/.ssh/id_ed25519.pub

Add this key to your GitHub or GitLab account by navigating to the SSH keys section in your account settings.

Testing Your Git Configuration

Clone a repository to test your configuration:

git clone [email protected]:your-username/your-repository.git

Replace your-username and your-repository with your GitHub username and repository name, respectively.

Common Git Commands

Here are some basic Git commands to get you started.

  • Initialize a new Git repository:

git init
  • Add files to the staging area:

git add <file>
  • Commit changes:

git commit -m "Commit message"
  • Push changes to a remote repository:

git push origin main
  • Pull changes from a remote repository:

git pull origin main

Troubleshooting Git Installation and Configuration Issues

If you encounter issues, consider these troubleshooting tips:

  • Ensure your system is updated by running sudo apt update && sudo apt upgrade.

  • Reinstall Git if necessary: sudo apt remove git followed by sudo apt install git.

  • Check for correct SSH key configuration if you face connectivity issues with GitHub/GitLab.

Conclusion

Installing and configuring Git on Ubuntu 22.04 is a straightforward process that equips you with a powerful tool for version control. By following this guide, you have set up Git, configured it with your personal information, generated SSH keys for secure access, and tested your setup. With Git, you can efficiently manage your projects and collaborate with others seamlessly. Happy coding!

Git Ubuntu
22.07.2024
Reading time: 3 min

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How to Use the Git Rebase Command

In Git, managing code history is important for tracking changes. For this purpose, git supports several commands, such as commit, log, diff, branch, merge, revert, and rebase. The git rebase command, in particular, is useful for keeping branch histories clean by allowing developers to reapply commits from one branch to another. In this article, we’ll discuss what git rebase is, how it differs from the git merge command, and how to use it to maintain a structured, linear commit history that’s easier to read and review. Understanding Git Rebase: What Is It? The git rebase command allows us to move, combine, reorder, edit, or remove commits. Moreover, it simplifies the project history by moving the commits of one branch onto the base of another branch. Rebase in git is especially useful when integrating changes into a feature branch, resulting in a streamlined history without unnecessary merge commits. Git Rebase vs. Git Merge: What’s the Difference? Both merge and rebase commands are used to combine branches, but they differ in how the commit history looks after one branch is added to another. Here’s a comparison to understand when to use rebase versus merge: Git Merge: It combines the histories of both branches and creates a merge commit, marking the point where they joined. This commit retains the complete history of both branches. Git Rebase: It applies changes from one branch to another and rewrites the history as though all work was done linearly. Git Merge maintains separate histories for each branch, while Git Rebase linearizes the history, making it appear as if all work was done in a straight line. When using git merge, the focus is on merging feature branches, whereas git rebase is used to rewrite and clean up the commit history for better organization and readability. Basic Syntax and Options for Git Rebase The git rebase command allows users to transfer commits from the current branch to the base of another branch. The basic syntax of the git rebase command is shown below: git rebase <target-branch> Users can use different options with the git rebase command, which are listed below:  git rebase master: This command adds all the changes from the master branch to your current branch. -I or --interactive: This option opens an editor to reorder, combine, or modify commits interactively. --onto <newbase>: This option enables us to set a new base commit for the rebase. We can use it to move several commits to a different branch or commit. --skip: This option skips a commit if there's a conflict during rebase. It tells Git to ignore that commit and continue with the rebase. --no-verify: This option ignores any pre-commit checks set up in the repository. It’s useful if we want to commit quickly without running those checks. --auto-squash: It automatically applies the fixup or squash flags to commits. This is helpful for cleaning up commit history during an interactive rebase. 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Step 2: Start interactive rebase Users can run the rebase command with the -i option to perform an interactive rebase: git rebase -i <target-branch> When a user runs this command, it opens the default text editor. The user will see a list of commits from the current branch that are not present in <target-branch>. Each commit comes with actions to choose from, such as: pick: Keep the commit as it is. edit: Stop and allow changes to the commit (like the message or the files). squash: Combine this commit with the one before it. drop: Removes a commit.  After the user makes the desired changes and saves the file, Git will continue the rebase based on the selected choices. Handling Merge Conflicts During Rebase When rebasing, conflicts can occur if the same line of code is modified in both branches. In that case, Git pauses the rebase process, allowing users to resolve conflicts. Follow the steps below to resolve the merge conflicts during the rebase: Step 1: Identify Conflicting Files Run the git status command to see where the problem/conflict lies in a Git repository: git status This command displays a list of files that have conflicts, marked as unmerged. Step 2: Edit the Conflicted Files When there are conflicts during a Git operation, like a merge or rebase, Git marks the conflicting parts in the files with special markers: <<<<<<< HEAD: It shows the user's changes (from the current branch). =======: It separates the user's changes from the other branch's changes. >>>>>>> <branch-name>: It shows the end of the conflicting section and shows the name of the branch with the conflicting changes. To resolve the conflicts, users should open the files in a text editor and decide which changes to keep. They can choose to: Keep their changes. Keep the changes from the other branch. Combine both sets of changes. 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30 October 2024 · 8 min to read
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26 September 2024 · 5 min to read
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Git Checkout: How to Work with Branches

The checkout command in the Git version control system is responsible for switching between different branches in a repository. Each switch updates the files in the working directory based on the data stored in the selected branch. Every subsequent commit is automatically added to the active branch chosen earlier using the checkout command. This guide will cover various ways to use the git checkout command and other related commands (such as git branch, git reflog, and git remote show), which enable interaction with both local and remote branches. 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Essentially, we want to test a hypothesis with the ability to revert changes to the stable version of the project. To do this, Git allows us to create separate branches and switch between them. This way, we can test the project both with and without the feature. But first, let’s check which branch we are currently on: git branch The console will display the output with the active branch, master, highlighted: * master We committed the previous changes to this branch, which means the file_m file is in this branch. Now, we’ll create a separate branch for our new feature using the same git branch command but with a new branch name: git branch feature1 It’s important to note that git branch does not automatically switch to the newly created branch. We can confirm this by rechecking the list of existing branches: git branch You’ll notice that the list now includes the feature1 branch, but the active branch (marked by green and asterisk) is still master: feature1* master Now we have multiple branches to switch between. Switching to an Existing Branch To manually switch to an existing branch, use the checkout command, specifying the branch name: git checkout feature1 The console will display a message confirming the successful switch: Switched to branch 'feature1' Let’s check the list of existing branches again: git branch As you can see, the active branch is now feature1: * feature1  master Let’s check the working directory again: ls It still contains the same file that was “inherited” from the master branch: file_m Since the feature1 branch is for modifying the project, we’ll create another file: sudo nano file_f1 Its content will be: file in feature1 Let’s stage the changes: git add file_f1 And commit them: git commit -m "Commit from feature1" Now, check the working directory again: ls You’ll see there are now multiple files: file_m  file_f1 Now, let’s switch back to the main branch: git checkout master After this, the working directory will only contain the original file: file_m Each time we switch between branches, the files in the working directory update to reflect the state of the commits that exist in the active branch. Switching to a New Branch Let’s assume we want to add another feature to our project, meaning we’ll need to create a new branch. First, ensure that we’re on the master branch: git checkout master Now, attempt to switch to a branch that hasn’t been created yet, feature2: git checkout feature2 As expected, you’ll receive an error: error: pathspec 'feature2' did not match any file(s) known to git However, the git checkout command allows you to create new branches while switching to them by using the -b flag: git checkout -b feature2 The console will display a message confirming the successful switch: Switched to a new branch 'feature2' In essence, git checkout with the -b flag is equivalent to running the following two commands: git branch feature2git checkout feature2 Recheck the list of existing branches: git branch Now we have the feature2 branch, which became active immediately upon its creation: feature1* feature2  master The new branch is based on the branch (its working directory and commit history) that was active before it was created. Since we switched to the master branch before creating feature2, the working directory should only contain the file file_m but not file_f1. Deleting a Branch You cannot delete a branch that is currently active: git branch -d feature2 The -d flag indicates the request to delete the specified branch. The console will display an error message: error: Cannot delete branch 'feature2' checked out at '/root/project' So, first, switch to another branch: git checkout master Then proceed with the branch deletion: git branch -d feature2 This time, the console will display a message confirming the successful deletion of the branch: Deleted branch feature2 (was 24c65ff). The list of existing branches will now look like this: feature1* master Creating a Branch from Another Branch Git allows you to specify which branch to base a new branch on without switching branches first. Let’s first ensure we're currently on the master branch: git checkout master At this point, the special HEAD pointer points to the active master branch, which, in turn, points to the latest commit of this branch. Previously, we created the feature2 branch from the active master branch. However, now we’ll create the feature2 branch from the feature1 branch (instead of master) without explicitly switching to it — we'll stay on master: git checkout -b feature2 feature1 Now the active branch is feature2. Let’s check the contents of the working directory: ls As you can see, the state of the directory matches feature1, not master: file_m  file_f1 We can also look at the commit history: git log The feature2 branch contains both the commits from master and from feature1: commit fb1b1616c85c258f647df4137df535df5ac17d6c (HEAD -> feature2, feature1)Author: root <[email protected]>Date:   Tue Feb 13 02:18:02 2024 +0100    Commit from feature1commit 24c65ffab574a5e478061034137298ca2ce33c94 (master)Author: root <[email protected]>Date:   Mon Feb 12 11:30:56 2024 +0100    First commit Resetting a Branch to Another Branch In addition to creating a branch from another, the checkout command can reset an existing branch to match the state of another branch. For example, we can reset the feature2 branch to match the state of master: git checkout -B feature2 master Note the use of the -B flag instead of -b. The console will show the following message: Reset branch 'feature2' Check the working directory: ls Only one file remains: file_m The list of "inherited" commits in the feature2 branch will now match the commits of the master branch: git log In the console, there will only be one commit — the very first one: commit 24c65ffab574a5e478061034137298ca2ce33c94 (HEAD -> feature2, master)Author: root <[email protected]>Date:   Mon Feb 12 11:30:56 2024 +0100    First commit Viewing Checkout History Switching branches is not just a read operation; it makes changes to the repository, creating a new record in the checkout history. Git has a special command to display the full history of branch switches: git reflog The history of operations is displayed from bottom to top, with the most recent switches at the top: fb1b161 (HEAD -> feature2, feature1) HEAD@{1}: checkout: moving from master to feature224c65ff (master) HEAD@{2}: checkout: moving from feature1 to masterfb1b161 (HEAD -> feature2, feature1) HEAD@{3}: commit: Added the first feature24c65ff (master) HEAD@{4}: checkout: moving from master to feature124c65ff (master) HEAD@{5}: checkout: moving from feature2 to master24c65ff (master) HEAD@{6}: checkout: moving from feature1 to feature224c65ff (master) HEAD@{7}: checkout: moving from master to feature124c65ff (master) HEAD@{8}: commit (initial): First commit Switching to a Remote Branch Adding a Remote Repository Suppose we have a remote GitHub repository we are working with over HTTPS: git remote add repository_remote https://github.com/USER/REPOSITORY.git Alternatively, we could access it via SSH: git remote add repository_remote [email protected]:USER/REPOSITORY.git In this case, an SSH key needs to be generated beforehand: ssh-keygen -t rsa -b 4096 -C "GITHUB_ACCOUNT_EMAIL" The public key (.pub), located in the /.ssh/known_hosts/ directory, is copied into the GitHub account settings under SSH Keys. In our case, the remote repository will be Nginx: git remote add repository_remote https://github.com/nginx/nginx Fetching Files from a Remote Branch After adding the remote repository, we can check the list of all its branches: git remote show repository_remote Before switching to a remote branch, we first need to retrieve detailed information about the remote repository — branches and tags: git fetch repository_remote You can also fetch from all remote repositories at once: git fetch --all Now, we can switch directly to a remote branch and retrieve its files into the working directory: git checkout branches/stable-0.5 In older Git versions, it was necessary to specify the remote repository explicitly: git checkout repository_remote/branches/stable-0.5 Now, if you run the command: git branch You will see the remote branch listed as active: * branches/stable-0.5  feature2  feature1  master Check the state of the working directory: ls Now it contains the following directories: auto  conf  contrib  docs  misc  src You can delete a remote branch just like a local one. First, switch to a different branch: git checkout master Then, delete the remote branch: git branch -D branches/stable-0.5 Now the branch list looks like this: feature2  feature1* master Switching to a Specific Commit Just like switching branches, you can switch to a specific commit. However, it's important to understand the difference between commits and branches. Branches diverge from the project's timeline without disrupting the sequence of changes, while commits are more like progress points, containing specific states of the project at particular times. Let’s first switch to the latest branch, which contains the most commits: git checkout feature2 To switch to a specific commit, provide the commit hash (ID) instead of the branch name: git checkout fb1b1616c85c258f647df4137df535df5ac17d6c To find the hash, use the command: git log In our case, the commit history looks like this (only the hashes may differ): commit fb1b1616c85c258f647df4137df535df5ac17d6c (HEAD -> feature2, feature1)Author: root <[email protected]>Date:   Tue Feb 13 02:18:02 2024 +0100    Commit from feature1commit 24c65ffab574a5e478061034137298ca2ce33c94 (master)Author: root <[email protected]>Date:   Mon Feb 12 11:30:56 2024 +0100    First commit After switching to a commit, you can check which branch is currently active: git branch The list of branches will now look like this: * (HEAD detached at fb1b1616c)  feature2  feature1  master This results in a "detached HEAD" state. Any subsequent commits won’t belong to any existing branch. However, this mode is risky — the lack of a specific branch in the HEAD pointer may result in data loss. For this reason, it's common to "wrap" the chosen commit in a new branch to continue project modifications. Switching to a specific commit is usually used to review changes made at a particular stage of development. Difference Between checkout and switch In later Git versions (2.23 and above), there’s another command for working with branches — switch. These commands are quite similar, but switch is more specialized: git switch is a new command focused more on branch operations. At the same time, git checkout is an older command that can also handle "peripheral" tasks, such as creating new branches while switching or modifying the working directory to match a specific commit's state. git checkout has a more universal (and less standardized) syntax, which can make it seem more complex and prone to errors compared to git switch. Conclusion In this guide, we’ve covered the git checkout command, primarily used for switching between different branches in a repository. Here’s a complete list of what the checkout command can do: Switch between existing local branches. Create new local branches, Create new local branches based on other branches. Reset existing local branches to the state of other branches. Switch between existing remote branches (and download their files into the working directory). Switch to a specific commit from a local or remote branch. After switching to another branch, the use of commands like git add and git commit typically follows to index changes and update the repository state within that branch. Always be cautious — switching branches after making changes in the working directory without committing can result in data loss. For more information on working with Git, refer to the official documentation.
26 September 2024 · 11 min to read

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