A Unix shell built from scratch in C, with a full-stack telemetry and prediction pipeline. CloudShell executes real system commands, tracks usage patterns, and uses a Markov chain model to predict the next command. All of this is served through a Dockerized FastAPI backend and a React dashboard.

Browser (React + xterm.js) ↕ WebSockets (terminal I/O) ↕ HTTP (stats, predictions) FastAPI Backend (Docker) ├── SQLite (telemetry storage) ├── PTY → C Shell process (custom shell that has bash functionality, coded for full functionality) └── Markov chain predictor

1. Features -Shell (C) -REPL loop with raw mode terminal input (termios) -Manual tokenizer and parser with quote and escape character support -Command execution via fork / execvp / waitpid -Built-in commands: cd, exit, jobs, fg, bg -Input and output redirection (<, >) -Single and multi-command pipes (|) -Background execution (&) -Job control with SIGTSTP, SIGINT, SIGCHLD handling -Process groups for correct signal delivery -Command history with arrow key navigation -Environment variable expansion ($VAR) -Execution telemetry: timestamp, command, exit code, working directory, duration

2. Backend (Python / FastAPI) /log — receives shell telemetry and stores in SQLite /predict — returns predicted next command using a Markov chain transition table /stats — returns top commands by frequency /health — health check endpoint onevent("startup") - creates database to store telemety onevent("shutdown")- kills current shell session and creates new one WebSocket endpoint for browser terminal (PTY bridge)

3. Frontend (React) -Browser-based terminal powered by xterm.js -Real-time WebSocket connection to shell process -Workflow graph visualizing command transition patterns (Yet to finish)