system-programming/exercises/coreutils/README.md

🛠️ Coreutils Reimplementations

This directory contains reimplementations of classic GNU Coreutils commands in C,
using only POSIX system calls and the standard C library.

The goal is to gain hands-on experience with Linux system programming, while practicing
error handling, portability, and clean coding.

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📂 Structure

Each command is implemented in its own folder:

coreutils/
├── ls/        # list directory contents
├── cat/       # concatenate files
├── cp/        # copy files
├── echo/      # echo a string
├── sleep/     # wait X millis

Each subfolder contains:

• main.c → source code
• Makefile → to build the command

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🎯 Learning Objectives

• Practice file and directory operations
• Reinforce knowledge of system calls: open, read, write, stat, opendir, unlink, link, etc.
• Develop robust error handling
• Understand the UNIX philosophy: small tools, combined power

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⚙️ Build & Run

Example (ls):

cd ls
make
./ls .

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Last updated: 2025-09-18