docs: function buildProcessTemplate(opts, callback) {
    var viewOpt = {
      app: opts.app,
      processName: opts.processName,
      directory: opts.directory,
      port: opts.port,
      command: opts.command,
      logRoot: opts.logRoot,
      num: opts.num,
      envVar: opts.envVar
    };
  
    renderTemplate(templateFilePath('process.conf', opts.templateOpt), viewOpt, function(err, renderedOutput) {
      if (err) {
        return callback(err.message);
      } else {
        return fs.writeFile(opts.writePath, renderedOutput, function(err) {
  	if (err) {
  	  return callback(err.message);
  	} else {
  	  return callback(null);
  	}
        });
      }
    });
  }