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Md. Mahmudul Hasan Mabud
Md. Mahmudul Hasan Mabud

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Beyond Syntax: Why I Built My Own Unix-like Shell in C

For a long time, my world of C programming revolved around HackerRank challenges, nested loops, and problem-solving. After earning my 4th star and building a few mini-projects, I hit a wall. I asked myself: "Okay, I know C—but what can I actually build that breathes life into a system?"

That curiosity led me to look under the hood of Linux. I knew that the core of these massive operating systems was written in C. Suddenly, my mind was flooded with "Hows":

How does a simple command typed in a terminal transform into a running process?

How does the system handle signals like Ctrl+C without crashing?

What really happens behind the scenes of process management and command history?
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Instead of just reading documentation, I decided to dive into the deep end: I started building my own Unix-like Shell from scratch.

Through this project, I realized that C isn't just a programming language; it’s a direct bridge to the heart of the operating system. In this series, I’m excited to share my journey of turning curiosity into code and building a functional shell, one system call at a time.

What was your first project that made you fall in love with system-level programming?

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