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    <p>You don't seem to understand how callbacks work in node.js. You will need to do some reading about it on stackoverflow or elsewhere.</p> <p>I rewrote your program (but didn't test it), study it and ask me if you have any questions.</p> <pre><code>// halts if the provided filename doesn't exist function assertFileExists(filename) { if (!fs.existsSync(filename)) { console.log("%s does not exist. Exiting.", filename); process.exit(1); } return filename; } // loads checks from a file function loadChecks(checksfile) { return JSON.parse(fs.readFileSync(checksfile)).sort(); } // checks html function checkHtml(html, checks) { $ = cheerio.load(html); var out = {}; for(var ii in checks) { var present = $(checks[ii]).length &gt; 0; out[checks[ii]] = present; } return out; } // loads html from a file and checks it // for exports only function checkHtmlFile(filename, checks) { return checkHtml(fs.readFileSync(filename), checks); } // downloads html from the internet // callback is called with two arguments: err, html // where err is null if there is no error function download(url, callback) { var resp = rest.get(url); resp.on('complete', function(result) { if (result instanceof Error) { // callback(result); sys.puts('Error: ' + result.message); this.retry(5000); // try again after 5 sec return; } callback(null, result); }); } if (require.main == module) { program .option('-c, --checks &lt;check_file&gt;', 'Path to checks.json', assertFileExists, CHECKSFILE_DEFAULT) .option('-f, --file &lt;html_file&gt;', 'Path to index.html', assertFileExists, HTMLFILE_DEFAULT) .option('-u, --url &lt;url&gt;', 'Path to downloaded url') /////////////// .parse(process.argv); // this function loads checks &amp; checks html function check(err, html) { if (err) { console.log('Error getting html: ' + err); process.exit(1); } var checks = loadChecks(program.checks); var checkJson = checkHtml(html, checks); var outJson = JSON.stringify(checkJson, null, 4); console.log(outJson); } if (program.url) { // download the provided url and then check the html download(program.url, check); } else if (program.file) { // load html from a file and then check it fs.readFile(program.file, check); } } else { exports.loadChecks = loadChecks; // for loading checks exports.checkHtmlFile = checkHtmlFile; // for checking a file } </code></pre>
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    1. COHi mak. First, big, big thanks for taking the time and do this rewrite. I just tried to run it with the -c and -u flag and I get the exact same error (file does not exists). I chmod it with u+x before. I don't find where I can specify which site to download in the code. If it should be at the commandline, it does not work. Maybe I am missing something really obvious. I will keep trying. Thanks again.
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    2. COAnd yes I still struggle to understand the callback. Not the concept, but the implications. Thanks again
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    3. CODownloading is part of this new rewrite, but writing to file is missing. Therefore the script is always getting an error. Where do I have to put the writing to file part ? Thanks.
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