📌 Essential Git Commands

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🔹 Understanding Git Commands

Git commands help developers track changes, collaborate efficiently, and manage project versions. Below are the essential commands every DevOps engineer must know.

1️⃣ Initializing a Git Repository

Command:

git init

Explanation: This command initializes a new Git repository in your project directory. It creates a hidden .git folder that stores all version control data.

✅ Best Practice: Run git init only once per project to avoid nested repositories.

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2️⃣ Cloning a Repository

Command:

git clone <repository_url>

Example:

git clone https://github.com/user/repo.git

Explanation: This command copies a remote repository to your local machine, allowing you to work on it.

✅ Best Practice: Always check the branch structure using git branch -a after cloning.

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3️⃣ Checking Repository Status

Command:

git status

Explanation: This command displays the current state of the working directory and staging area. It helps you track untracked, modified, or staged files.

✅ Best Practice: Use git status before committing changes to avoid unnecessary files being committed.

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4️⃣ Adding Files to Staging Area

Command:

git add <file_name>  
# OR add all files  
git add .

Explanation: Moves files from the working directory to the staging area, preparing them for commit.

✅ Best Practice: Use git add -p for selective staging to commit only specific changes.

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5️⃣ Committing Changes

Command:

git commit -m "Descriptive commit message"

Explanation: Creates a new version of the project with a descriptive message explaining the changes.

✅ Best Practice: Write meaningful commit messages to improve collaboration. Example:

git commit -m "Fixed login issue by updating authentication logic"

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6️⃣ Viewing Commit History

Command:

git log

Explanation: Displays a list of previous commits along with details like author, date, and commit hash.

✅ Best Practice: Use git log --oneline --graph --all for a concise, visual representation of commit history.

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7️⃣ Branching and Switching Branches

Commands:

git branch <new_branch_name>
git checkout <branch_name>

Explanation: Branching allows developers to work on different features without affecting the main project.

✅ Best Practice: Use git checkout -b <branch_name> to create and switch to a new branch in one step.

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8️⃣ Merging Branches

Command:

git merge <branch_name>

Explanation: Combines changes from another branch into the current branch.

✅ Best Practice: Always pull the latest changes using git pull before merging to avoid conflicts.

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9️⃣ Pushing Changes to Remote Repository

Command:

git push origin <branch_name>

Explanation: Sends local commits to a remote repository.

✅ Best Practice: Use git push -u origin <branch_name> for the first push to set an upstream branch.

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🔟 Pulling Latest Changes from Remote

Command:

git pull origin <branch_name>

Explanation: Fetches and integrates changes from the remote repository into the current branch.

✅ Best Practice: Always run git pull --rebase before starting work to avoid merge conflicts.

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🔹 Key Takeaways

✔️ Use git status frequently to check your working state.
✔️ Always write meaningful commit messages.
✔️ Use branches to work on different features safely.
✔️ Pull before push to avoid conflicts.

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