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One should be careful around lesspipe -- many of the tools it invokes by default have less than stellar record of handling untrusted input. https://news.ycombinator.com/item?id=8650952

That’s a good point. I wonder if xdg-open relies on any of the same routines.

I've run into too many problems with .lessfilter and I've had to disable it. It's hard to write one that works on anything.

Looks like mine relies heavily on pandoc, unoconv, xxd, jq, and OpenSSL. Apparently, some packagers include an enhanced OS customization with high-risk information retrieval tools (see seclists comment).

pdftotext seems reasonable and looks to be part of the Debian lessfilter.

Thanks - I will check that out.