index.js

const net = require("net");

const PORT = 6969;

const server = net.createServer();

server.on("connection", function(sock) {
    console.log("CONNECTED: " + sock.remoteAddress + ":" + sock.remotePort);
    sock.setEncoding("utf8");

    sock.write("This is The GNU Hurd. Welcome.\n\n> ");
    
    sock.on("data", function(data) {
        if (data.startsWith("exit")) {
            sock.write("The GNU Hurd bids you farewell.");
            console.log("DISCONNECTED: " + sock.remoteAddress + ":" + sock.remotePort)
            sock.resetAndDestroy();
        } else if (data.startsWith("help")) {
            sock.write("The GNU Hurd is aware of the following commands:\n- exit : Exit The GNU Hurd\n- help : Ask The GNU Hurd to show the help info\n")
        } else {
            sock.write("The GNU Hurd is not familiar with this command:\n" + data);
        }
        sock.write("> ");
    });

    sock.on("end", function() {
        console.log("DISCONNECTED: " + sock.remoteAddress + ":" + sock.remotePort)
    });

    sock.on("error", function(err) {
        console.log("ERROR FOR " + sock.remoteAddress + ": " + err);
    });
});

server.listen(PORT, () => {
    console.log("Running on port " + PORT + ".");
});