HKU-COMP3230-Shell

Introduction

This project simulates a Linux terminal shell utilizing system programming concepts like process creation (fork()), inter-process communication (pipe()), and signal handling. It was developed as part of the COMP3230 Principles of Operating Systems course at The University of Hong Kong.

Achievements

• Scored 11.5/12 for core functionality.
• Scored 4/4 for bonus features.

Features

• Executes commands by creating child processes.
• Handles absolute, relative, and PATH environment variable paths for command execution.
• Supports built-in commands:
  • exit: Terminates the shell.
  • timeX: Prints process statistics of terminated child processes.
• Implements operators:
  • &: Executes commands in the background.
  • |: Pipes the output of one command as the input to another.
• Robust to SIGINT (Ctrl-C) interruptions.
• Handles SIGUSR1 for controlled execution of child processes.
• Handles SIGCHLD for background process termination.

Quick Start

1. Clone the repository:

   git clone https://github.com/Henryyy-Hung/HKU-COMP3230-Shell

2. Navigate to the project directory:

   cd HKU-COMP3230-Shell/src

3. Build the project:

   make all

4. Run the shell:

   ./3230shell

Preview

Here's a snapshot of what the shell looks like in action: