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//note: http://www.html-js.com/article/1961

// Function to download file using wget
var download_file_wget = function(file_url) {

    // extract the file name
    var file_name = url.parse(file_url).pathname.split('/').pop();
    // compose the wget command
    var wget = 'wget -P ' + DOWNLOAD_DIR + ' ' + file_url;
    // excute wget using child_process' exec function

    var child = exec(wget, function(err, stdout, stderr) {
        if (err) throw err;
        else console.log(file_name + ' downloaded to ' + DOWNLOAD_DIR);
    });
};