I have a File variable called dir and i'm building a simple file explorer for my device. Is there a way to get a reference to dir's parent directory?

  • Doesn't dir.name() return dir's name with the path?
    – ocrdu
    Commented Dec 14, 2020 at 19:18
  • Unfortunately it only returns the name
    – none none
    Commented Dec 14, 2020 at 19:43
  • 1
    Then probably the only way is to keep a list of the directories you traversed while going to that file, or while building the directory structure from root. There may be an other way, but I don't know the SD library well enough.
    – ocrdu
    Commented Dec 14, 2020 at 20:03

1 Answer 1


I don't think there is an inbuilt function returning the parent, but you could do:

FS &file_system = SD; // pick whichever file system you use

File get_parent(File dir) {
  String dirPath = dir.path();
  int lastSlashIndex = dirPath.lastIndexOf('/');
  if (lastSlashIndex != -1) {
    String parentDirPath = dirPath.substring(0, lastSlashIndex);
    File parentDir = file_system.open(parentDirPath.c_str());
    return parentDir;
  return File();
  • 1
    but there is no path function in the Arduino SD library. (and no FS type)
    – Juraj
    Commented Aug 28, 2023 at 13:11
  • I only have esp32-S3 at hand here, and path() is available in framework-arduinoespressif32 -> FS.h, I don't know the situation for other platforms/architectures. Commented Aug 29, 2023 at 16:25

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