gistfile1.js

var system = require('system');
var args = system.args;
var env = system.env;
var os = system.os;

console.log("\nSYSTEM");
console.log(os.architecture);  // '64bit/32bit'
console.log('os',os.name);  // 'mac/windows'
console.log('version',os.version);  // '10.9 (Mavericks)/7'
console.log('pid',system.pid)

console.log("\nARGS")
args.forEach(function(value,key) {
  console.log(key + '=' + value);
});

// ARGS
// 0=webpage.js
// 1=http://www.google.com
// 2=bar.png


console.log("\nENV")
Object.keys(env).forEach(function(key) {
  console.log(key + '=' + env[key]);
});

var site_url = args.length > 0 && args[1] || "http://google.com";
var capture_file = args.length > 1 && args[2] || 'webpage.png';

if(args.length === 1){
	console.log("usage: phantomjs webpage.js website_url output_file");
	phantom.exit();
}

var t = Date.now();

var page = require('webpage').create();
page.onResourceRequested = function(request) {
  console.log('Request ' + JSON.stringify(request, undefined, 4));
};
page.onResourceReceived = function(response) {
  console.log('Receive ' + JSON.stringify(response, undefined, 4));
};
page.open(site_url, function(status){
	t = Date.now() - t;
	console.log('Loading ' + system.args[1]);
    	console.log('Loading time ' + t + ' msec');
	if(status === "success"){
		console.log("Rendering Image:",capture_file,status);
		page.render("./img/"+capture_file);
		
	}
	phantom.exit();
});

console.log(">>>",site_url,capture_file)