anchor.diff:              ?DEBUG("No script_file specified.", []),
               ok;
           "none" ->
  -            ?DEBUG("Shell script execution skipped (--script_file none).", []),
  +            ?DEBUG("Shell script execution skipped (--script none).", []),
               ok;
           RelFile ->
               File = filename:absname(RelFile),
  
positive.code:     {Opts, _} = rebar_state:command_parsed_args(State),
      case debug_get_value(apps, Opts, no_value,
                           "Found shell apps from command line option.") of
          no_value -> no_value;
          AppsStr ->
              [ list_to_atom(AppStr)
                || AppStr <- rebar_string:lexemes(AppsStr, " ,:") ]
  
negative.code:                          "shell. (E.g. --apps app1,app2,app3) Defaults "
                           "to rebar.config {shell, [{apps, Apps}]} or "
                           "relx apps if not specified."},
                          {start_clean, undefined, "start-clean", boolean,
                           "Cancel any applications in the 'apps' list "
                           "or release."},
                          {user_drv_args, undefined, "user_drv_args", string,
                           "Arguments passed to user_drv start function for "
                           "creating custom shells."}]}
  