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    Note: "to count non empty and empty directories with size 4096" (the title) and "to count empty and non empty directories" (the first sentence of the body) are two different tasks. In ext a directory can take more bytes regardless whether it's empty or not. It's not clear which task you want. Please edit and clarify. Commented Aug 29, 2021 at 7:13
  • the 4096 size is the size of the inodes needed to contains the list of files+dirs within that directory. It will be 1 block of inodes (4k) if the dir was always empty or always had few files+dirs within, or more if you have many files+dirs within that directory. Once it is enlarged to hold a long list of filenames, it will not shrink back after you delete those files. You would need to create another dir and replace it with that new one. Commented Aug 30, 2021 at 7:05