pdftocar: How to save the help text in text file from the prompt?

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I would like to save the help text of the program pdftocairo located in the installation subfolders of the MiKTeX for Windows.

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The command pdftocairo --help > help_pdftocairo.txt, which should create the archive help_pdftocairo.txt with the help content (as here), actually creates a blank file.

Any idea how to proceed?

cmd prompt

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It is a specific case where the exit leads via stderr = 2> and didn’t see stdout = 1>, use 2>

What worked here with in the case of pdftocairo.exe --help was: 

2>pdftocairo.txt pdftocairo --help

Since this program has the route directed output stderr and not stdout, then, it will only record the desired content if it treat as error capture(stderr), and not a normal exit(stdout).

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