MyShell – Custom Command-Line Interpreter | C, Linux

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MyShell — Presentation Script

MyShell is a custom Unix-like command-line interpreter developed from scratch in C for the Linux environment. The core objective of this project was to understand the low-level mechanics of an operating system by building a functional shell that interacts directly with the Linux kernel through system calls.

The application operates on a continuous read-evaluate-print loop. Behind the scenes, it handles several critical operating system concepts:

Command Parsing: The shell takes raw user input as a single string and dynamically breaks it down into executable commands and arguments. This required careful string tokenization and manual pointer management in C.

Process Management: To execute external commands safely without crashing the shell itself, I implemented the fork-and-exec pattern. The shell uses fork() to create a child process, exec() to run the requested command, and wait() to ensure the parent shell suspends until the child process finishes execution.

Built-in Commands: I also integrated built-in shell commands like cd and exit. These are handled directly within the parent process using functions like chdir(), since creating a separate process wouldn't correctly modify the shell's own working directory.

Ultimately, MyShell is more than just a basic program; it demonstrates a strong grasp of systems programming, memory safety, and a deep understanding of how Linux manages processes and environment states.