process 객체란 무엇이며 무엇을 할 수 있나요?

// node script.js --name=Ann
process.argv; // ["node", "/path/script.js", "--name=Ann"]
const args = process.argv.slice(2); // skip the first two

process.stdout.write("output\n");   // console.log writes here
process.stderr.write("error\n");    // console.error writes here
process.stdin.on("data", (chunk) => { /* read input */ });

process.exit(0);   // exit with success code (1 = error)
process.exitCode = 1; // preferred: set code, let the process finish naturally
process.pid;       // the process id
process.cwd();     // current working directory
process.uptime();  // seconds the process has run

process.on("SIGTERM", () => { /* clean up, then exit — e.g. on container stop */ });
process.on("SIGINT", () => { /* Ctrl+C */ });
process.on("uncaughtException", (err) => { log(err); process.exit(1); });
process.on("unhandledRejection", (reason) => { log(reason); });

process.memoryUsage(); // heap stats (leak detection)
process.nextTick(cb);  // schedule a callback before the next event-loop phase
process.platform;      // "linux" | "darwin" | "win32"