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How to search multiple pdf documents for words on Linux

When it comes to text search within a pdf document, pretty much every pdf reader software supports it (be it Adobe Reader or any third-party pdf viewer). However, it becomes tricky when there are more than one pdf document to search. In Linux, there are command-line tools (e.g., pdftotext or pdfgrep) that can be used to do simple search on multiple pdf documents at once.

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