K2SH - A Simple Unix Shell

K2SH is a lightweight, custom-built shell implemented in C. It supports basic command execution, built-in functions, and pipelines using |. I built this to learn how Unix-like shells work under the hood.

---

Features

• Run external commands (e.g., ls, grep, cat)
• Execute pipelines like ls | grep txt
• Built-in commands:
  • cd – Change directory
  • pwd – Print working directory
  • echo – Print text
  • history – Show command history
  • help – List built-in commands
  • exit – Exit the shell
• Tracks command history (up to 1000 entries)
• Modular design with a clean Makefile for building and running

---

Building K2SH

The project includes a flexible Makefile with debug and release modes.

Build (Debug mode, default)

make

Build (Release mode)

make release

---

Running K2SH

./k2sh

Or with Makefile

make run # Runs the debug version
make run-release # Runs the optimized version