• @dan@upvote.au
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    210 months ago

    Linux mostly doesn’t use file extensions… It relies on “magic bytes” in the file.

    Same with the web in general - it relies purely on MIME type (e.g. text/html for HTML files) and doesn’t care about extensions at all.

      • @dan@upvote.au
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        310 months ago

        The library that handles it is literally called “libmagic”. I’d guess the phrase “magic bytes” comes from the programming concept of a magic number?

        • @fibojoly@sh.itjust.works
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          210 months ago

          I did not know about that one! It makes sense though, because a lot of headers would start with, well yeah, “magic numbers”. Makes sense.