fs.createWriteStream example from the command line

writeStream.js

var fs = require('fs');

process.stdin.resume();
process.stdin.setEncoding('utf8');

var stream = fs.createWriteStream(process.argv[2]);
process.stdin.on('data', function(text) {
	if (text === 'quit\n') {
		stream.end();
		process.exit();
	}
	stream.write(text);
});