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github/3_commit_existing_repo_github_ubuntu.md

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+## 📘 `3_commit_existing_repo_github_ubuntu.md`
+
+### 📌 Purpose
+
+Work with an existing remote GitHub repository on Ubuntu. This includes cloning, committing changes, and pushing updates.
+
+---
+
+### 🛠️ Step-by-Step
+
+#### Step 1: Clone the repository
+
+```bash
+git clone git@github.com:your-username/your-repo-name.git
+cd your-repo-name
+```
+
+---
+
+#### Step 2: Make your changes
+
+```bash
+nano example.txt
+```
+
+Or update files as needed.
+
+---
+
+#### Step 3: Stage and commit your changes
+
+```bash
+git add .
+git commit -m "Describe your update"
+```
+
+---
+
+#### Step 4: Push to GitHub
+
+```bash
+git push origin main
+```
+
+> Use the correct branch name if not `main`. Confirm with:
+
+```bash
+git branch
+```
+
+---