Custom Linux Shell (mysh)

Overview

mysh is a simple yet powerful custom Linux shell implemented in C. It replicates basic behavior of standard shells like bash or sh, allowing users to run Linux commands, built-in shell functions, and now supports features like piping, redirection, and background execution.

This project demonstrates core systems programming concepts including process creation, file descriptor manipulation, command parsing, and signal handling.

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Project Structure

├── custom-linux-shell
│    ├── src
│    │  ├── main.c
│    │  ├── parser.c # Command parsing implementation 
│    │  ├── executor.c # Command execution logic
│    │  ├── builtins.c # Implementation of shell built-in commands
│    │  ├── utils.c # Utility functions
│    ├── include
│       ├── parser.h # Parser function declarations
│       ├── executor.h # Executor function declarations
│       ├── builtins.h # Utility function declarations
│       ├── utils.h # Built-in command declarations
├── 
├── Makefile # Build script for compiling the shell
├── README.md
└── .gitignore

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Features

• Execute standard Linux commands (e.g., ls, pwd, cat)
• Built-in commands (e.g., cd, exit)
• Pipes (|) to connect multiple commands
• Background process execution using &
• Input (<) and output (>) redirection
• Modular, extensible design

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How to Build and Run

1. Clone the repository or download the source code.
2. Open a terminal and navigate to the project directory.
3. Build the shell by running:

   make

4. Run the executable and test the above features

   ./mysh