Dax Shell

Dax is a custom Unix shell implementation written in C++. It provides a familiar command-line interface with support for standard shell features, including command execution, piping, redirection, and built-in commands.

Features

• Custom Prompt: Displays the current directory in green, with ~ expansion for the home directory.
• Command Execution: Run standard Linux commands (e.g., ls, grep, vim).
• Piping: Connect commands using pipes (|).
• Redirection: Support for input (<), output (>), and append (>>) redirection.
• Command Lists: Execute multiple commands sequentially using semicolons (;).
• Built-in Commands:
  • cd: Change directory.
  • pwd: Print working directory.
  • echo: Print arguments to standard output.
  • export: Set environment variables.
  • alias / unalias: Create and remove command aliases.
  • history: View command history.
  • exit: Exit the shell.
• History Management: Persistent command history saved to ~/.dax_history. Supports arrow key navigation (via readline).
• Signal Handling: Gracefully handles SIGINT (Ctrl+C).

Installation

Build

1. Clone the repository:

   git clone https://github.com/sameepkat/Dax.git
   cd Dax

2. Compile the project using make:

   make

   This will create an executable named main.

Usage

Start the shell by running the executable:

./main

Examples

Navigation and File Operations:

Dax > ls -la
Dax > cd ..
Dax > pwd

Piping and Redirection:

Dax > ls | grep cpp > sources.txt
Dax > cat sources.txt

History:

Dax > history
Dax > history 10  # Show last 10 commands

Environment Variables:

Dax > export MY_VAR=hello
Dax > echo $MY_VAR

Project Structure

• main.cpp: Entry point, main loop, and prompt handling.
• parser.cpp / parser.hpp: AST construction and execution logic.
• tokenizer.cpp / tokenizer.hpp: Lexical analysis and token generation.
• builtins.cpp / builtins.hpp: Implementation of built-in shell commands.
• helper.cpp / helper.hpp: Utility functions.
• signal_handler.cpp / signal_handler.hpp: Signal handling setup.
• Makefile: Build configuration.