docs: function (lines, cb) {
      fs.stat(HOSTS, function (err, stat) {
        if (err) {
          cb(err);
        } else {
          var s = fs.createWriteStream(HOSTS, { mode: stat.mode });
          s.on('close', cb);
          s.on('error', cb);
  
          lines.forEach(function (line, lineNum) {
            if (Array.isArray(line)) {
              line = line[0] + ' ' + line[1];
            }
            s.write(line + (lineNum === lines.length - 1 ? '' : EOL));
          });
          s.end();
        }
      });
    }