anchor.diff:    ProcessCount = build_cli_option("-p", num_processes, Opts),
     FilesCount = build_cli_option("-f", files_count, Opts),
     Mount = build_cli_option("-i", image, Opts),
  -  
  -  lists:flatten(["exec ", 
  +  User = build_cli_option("-u", user, Opts),
  +  
  +  lists:flatten([
       babysitter:isolate_command(), 
       ConfineDirectory,
       SkelOrDirs,
  
positive.code:     FilesCount,
      Mount,
      Env,
      " ",
      Command
    ]).
  
negative.code: 
  % Fetch values and defaults
  fetch_value(vars, Opts) -> opt_or_default(vars, [], Opts);
  fetch_value(user, Opts) -> opt_or_default(user, undefined, Opts);
  fetch_value(env_vars, Opts) -> opt_or_default(env_vars, [], Opts);
  fetch_value(num_processes, Opts) -> opt_or_default(num_processes, "5", Opts);
  fetch_value(files_count, Opts) -> opt_or_default(files_count, "5", Opts);
  