echo

A lightweight, freestanding C99 reimplementation of the Unix echo utility.

Overview

Designed without standard I/O library dependencies (stdio.h), interacting directly with the OS kernel via POSIX system calls (unistd.h).

Features

• Sequential flag parsing supporting single and chained -n flags (e.g., -n, -nnnn).
• Exact argument formatting preserving trailing boundaries and standard line breaks.
• Minimal footprint with zero dynamic memory allocation (malloc/free).

Build & Usage

make
./echo Hello world
./echo -nnnn "No trailing newline"

Rules

• make : Compile binary with -Wall -Wextra -Werror
• make clean : Remove object files
• make fclean : Remove object files and binary
• make re : Full rebuild