anchor.diff:        await withoutTaqo.copy(path.join(Platform.environment['HOME'], shrc));
       } on Exception catch (e) {
         if (!(await withoutTaqo.exists())) {
  -        _logger.warning("Failed writing $shrc; new file would have been empty");
  +        _logger.warning("Not writing $shrc; file would have been empty");
         } else {
           _logger.warning(e);
         }
  
positive.code:   final zshCmd = getZshPreCmd(DartFileStorage.getLocalStorageDir().path);
  
    try {
      // TODO Could we check for an existing function definition?
      await zshrc.writeAsString('$_beginTaqo\n', mode: FileMode.append);
      await zshrc.writeAsString("precmd() { eval '${zshCmd}' }\n", mode: FileMode.append);
  
negative.code:   final bashCmd = getBashPromptCmd(DartFileStorage.getLocalStorageDir().path);
  
    try {
      // Create it in case the user doesn't have a .bashrc but may use bash anyway
      if (!(await bashrc.exists())) {
        await bashrc.create();
      }
  
      await bashrc.writeAsString('$_beginTaqo\n', mode: FileMode.append);
      if (existingCommand == null) {
        await bashrc.writeAsString("export PROMPT_COMMAND='$bashCmd'\n",
  