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+# 🗂️ Exercise Index – Linux System Programming
+
+This is an organized list of all exercises completed so far, including a brief description and links to related resources or files.
+
+---
+
+## 📁 mycp
+
+**Description**: A simple file copy utility implemented in C using low-level system calls (`open`, `read`, `write`, `close`).
+
+- 📄 [README](mycp/README.md)
+- 📂 Directory: `mycp/`
+- ✅ Features:
+  - Error handling via `perror` and `errno`
+  - Safe loop with `EINTR` handling
+  - Proper resource cleanup
+  - Integrated unit tests and Valgrind checks
+
+---
+
+## 🌳 tree
+
+**Description**: A basic reimplementation of the Unix `tree` utility that recursively lists directories and files.
+
+- 📄 [README](tree/README.md)
+- 📂 Directory: `tree/`
+- ✅ Features:
+  - Recursive traversal using `opendir` and `readdir`
+  - Directory depth display
+  - Unit tests with mocks for directory structure
+  - Scripted test automation with Valgrind integration
+
+---
+
+## 🔧 Tooling & Automation
+
+**Shared tools and scripts used across projects**:
+
+- `Makefile` with:
+  - Targets for `build`, `test`, `valgrind`, and `clean`
+- Shell script for automated tests: `run_tests.sh`
+- Valgrind memory check reports generated automatically
+
+*Last updated: 2025-06-30*