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How to run PDFbox at terminal

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I installed libpdfbox-java as this apt instructions, sudo apt install libpdfbox-java.

Now, how to use it? can I run something as ShowSignature myDoc.pdf at terminal?
How to run it?


Notes

If a specialized answer is difficult, we can explode the question into steps:

  1. Where the path? to, perhaps, use some ugly long java -jar magicPath/pdfbox-app-ETC.jar (no pretty Ubuntu cmd to use it?)
  2. How to check version, cmd --version?
  3. ... them, perhaps, if apt installed version 2+, I can use Apache instructions of https://pdfbox.apache.org/2.0/commandline.html or https://pdfbox.apache.org/3.0/commandline.html

Motivation: I am using pdfsig myDoc.pdf but it say "Certificate Validation: Certificate issuer is unknown.", that is a software bug... So people suggested to use PDFbox.

I sit in a Tesla and translated this thread with Ai:

mangohost

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