private static @NotNull String trivialDefaultShellDetection() {
    String shell = System.getenv("SHELL");
    if (shell != null && new File(shell).canExecute()) {
      return shell;
    }
    if (SystemInfo.isUnix) {
      String bashPath = "/bin/bash";
      if (new File(bashPath).exists()) {
        return bashPath;
      }
      return "/bin/sh";
    }
    return "powershell.exe";
  }
private static @NotNull String trivialDefaultShellDetection()