psh

A minimal shell written in C

Features

• Execute system commands
• Built-in commands (cd, exit, pwd)
• Command history navigation
• Supports Linux and MacOS
• Lightweight and fast

Installation

# Clone the repository
git clone https://github.com/yourusername/psh.git
cd psh

# Quick Install (installation bash script)
./install.sh

# Manual Install (makefile)
make
sudo make install

Uninstall

sudo make uninstall

Usage

Launch psh by typing:

psh

inside your terminal

Example Commands

Basic commands:

psh> ls -la
psh> cat file.txt
psh> echo "Hello, World!"
psh> mkdir newfolder

What is a Shell exactly?

A shell is the interface that sits between the applications and the kernel. It takes a command, parses it, separates it into tokens, executes system calls based on them

psh Shell Lifecycle

1. Prompt
2. Read input
3. Lex input
4. Parse Lexed input
5. Interpret Parsed input
6. Repeat
7. Cleanup

Current Limitations ⚠️

• No pipe support (|) yet
• No redirection (>, <) yet
• No logical operators (&&, ||) yet
• No background processes (&) yet
• No command history by arrow keys yet

Contributing

Contributions are welcome! Feel free to open issues or submit pull requests.

License

MIT License