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It is my understanding that ipdf is based on xpdf, so the capability already exists - it just needs to be "turned on" in ipdf. This might involve a significant amount of work, but at least there is code (in xpdf) implementing the underlying capability.
Speaking as someone with no experience porting code to the iLiad, I assume getting pdftotext working on the iLiad should be relatively easy. Searching PDF's from the command line will then be possible, and then the question is how to make a system-wide PDF text search capability available (via scripts?, run pdftotext in-line or off-line?, use an existing system-wide search system? ...).
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