Details

NotebookFileName returns the absolute file name for the notebook as a string.
NotebookFileName gives $Failed if the specified notebook has never been saved as a file.
The file name given by NotebookFileName is on the filesystem of the computer on which the notebook front end is being run.

Examples

Get the name of the file for the current evaluation notebook:

Wolfram Language code: NotebookFileName[]//FileNameTake

Create a notebook, save it in a file and then open it:

Wolfram Language code: NotebookSave[Notebook[{Cell["Hello", "Text"]}], FileNameJoin[{$TemporaryDirectory, "Hello.nb"}]]

Wolfram Language code: nb = NotebookOpen[FileNameJoin[{$TemporaryDirectory, "Hello.nb"}]];

Find the file name for the notebook:

Wolfram Language code: NotebookFileName[nb]

Close the notebook and delete the file:

Wolfram Language code: NotebookClose[nb]

Wolfram Language code: DeleteFile[FileNameJoin[{$TemporaryDirectory, "Hello.nb"}]]

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