gistfile1.js

var sys = require('sys'),
fs = require('fs');

var b=new Buffer('hello world');

fs.open('test','w',undefined, function(err,fd){
	if(err) throw err;
	
	
	fs.write(fd,b,0,b.length,3,function(err,written){
		console.log(written + " bytes were written");
		fs.close(fd);
	});
});