code: function command(cmd, cb, opts = {}) {
      const options = {
          silent: false,
          maxBuffer: 10240000,
          ...opts
      };
      const command = exec(`${cmd}`, { maxBuffer: options.maxBuffer }, cb);
  
      if (!options.silent) {
          command.stdout.on('data', stdOut);
          command.stderr.on('data', stdErr);
      }
  }
docs: Execute the shell command given as a parameter and execute the callback at the end. Callback has profile:
  `function(err, stdout, stderr)`
  @param cmd the command to execute
  @param cb the callback that will be called after the function is executed.
  @param opts additional options
  @attr silent flag to deactivate the live stderr and stdout. Default to false
  @attr maxBuffer value of the buffer to store the live outputs. Default to 10240000