You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: cfg_util.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/matlabbatch
    
    the code of the file until where you have to start completion: function varargout = cfg_util(cmd, varargin)

% This is the command line interface to the batch system. It manages the
% following structures:
% * Generic configuration structure c0. This structure will be initialised
%   to an cfg_repeat with empty .values list. Each application should
%   provide an application-specific master configuration file, which
%   describes the executable module(s) of an application and their inputs.
%   This configuration will be rooted directly under the master

    
function varargout = cfg_util(cmd, varargin)

% This is the command line interface to the batch system. It manages the
% following structures:
% * Generic configuration structure c0. This structure will be initialised
%   to an cfg_repeat with empty .values list. Each application should
%   provide an application-specific master configuration file, which
%   describes the executable module(s) of an application and their inputs.
%   This configuration will be rooted directly under the master
%   configuration node. In this way, modules of different applications can
%   be combined with each other.
%   CAVE: the root nodes of each application must have an unique tag -
%   cfg_util will refuse to add an application which has a root tag that is
%   already used by another application.
% * Job specific configuration structure cj. This structure contains the
%   modules to be executed in a job, their input arguments and
%   depend