Tiny Shell — mysh 🐚⚡

Custom Unix-like Shell with Built-ins, Aliases, Pipes, and Redirection

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✨ Overview

This project implements a lightweight shell (mysh) in C.
It started as an Operating Systems assignment and was extended into a practical developer tool.

It demonstrates:

• Process control (fork, execvp, wait)
• System calls (I/O, file descriptors)
• User experience (history, aliases, configs)

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🔍 Features

• Dynamic prompt: user@host:cwd$mysh>
• Built-ins: cd, pwd, exit, export, alias, unalias, which
• Configurable startup (~/.myshrc)
• Aliases & environment variable support
• Command history & search (GNU Readline: ↑ ↓, Ctrl+R)
• Pipes & redirection (|, <, >, >>)
• Error handling with descriptive messages

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🚦 Quickstart

Build and run:

make
./mysh

Example session:

mysh> alias ll="ls -la"
mysh> export PATH=$PATH:/usr/local/bin
mysh> cat file.txt | grep "hello" > out.txt
mysh> which python
/usr/bin/python

📁 Repository Layout

code-tiny-shell/
├─ src/         # source code (mysh.c + helpers)
├─ tests/       # sample scripts and test cases
├─ docs/        # design notes, demo screenshots
├─ Makefile     # build rules (gcc + readline)
└─ README.md

📊 Demo

🔮 Roadmap

• Add tab-completion for commands
• Add background process support (&)
• Add colored prompt themes

📜 License

MIT (see LICENSE)

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