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I have some code, currently in a notebook, which should produce some output in the same directory as the notebook, for which I am using NotebookDirectory[]. I would also like to run this code in a .wls script file on a server, for which I believe I can get the script file directory using $InputFileName. However, I would like to have the same code in the notebook and the script file; is there some way to detect whether the current code is being run from a notebook or from a script, so that I can get the relevant file's directory in an agnostic way?

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    $\begingroup$ As per documentation for $InputFileName, this variable is empty ("") if the input does not come from a file. So you can check whether $InputFileName === "". $\endgroup$ Commented Aug 14 at 14:38
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    $\begingroup$ In addition to what @Domen mentioned, I tend to use $NotebookDirectory=DirectoryName[$InputFileName] in my .wls files for this purpose, with a Which clause to determine whether it's a script or a notebook. $\endgroup$ Commented Aug 14 at 18:40

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