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How to search multiple pdf documents for words on Linux

When it comes to searching text within a PDF document, pretty much every PDF reader supports it. However, it becomes tricky when there are more than one PDF document to search. While the official Adobe Reader offers multiple PDF search functionality (i.e., searching all PDF files in a directory), it has discontinued on Linux. None of other third-party PDF viewers (e.g., Evince, Okular, Xpdf) can search multiple PDF documents.

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