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gitlab/3_commit_existing_repo_gitlab_ubuntu.md

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+### 📘 `3_commit_existing_repo_gitlab_ubuntu.md`
+
+```markdown
+## 📘 `3_commit_existing_repo_gitlab_ubuntu.md`
+
+### 📌 Purpose
+
+Work with an existing GitLab repo: clone, edit, commit, and push using Ubuntu.
+
+---
+
+### 🛠️ Step-by-Step
+
+#### Step 1: Clone the repository
+
+```bash
+git clone git@gitlab.com:your-username/your-repo.git
+cd your-repo
+````
+
+---
+
+#### Step 2: Edit files
+
+```bash
+nano myfile.txt
+```
+
+---
+
+#### Step 3: Stage and commit
+
+```bash
+git add .
+git commit -m "Your change description"
+```
+
+---
+
+#### Step 4: Push your changes
+
+```bash
+git push origin master
+```
+
+If you use another branch (e.g., `main`, `dev`), substitute accordingly.
+
+---
+
+````
+
+---
+