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grep --mmap ...already? Real programmers would do that withvim -R -b 400gbfileand then/pattern.grep --only-matching --byte-offset --binary. The--only-matchingoption can be implemented without buffering the whole line, but I don't know if your implementation does take advantage of this to actually save memory.--byte-offsetwill indicate where the matching sequence starts in the binary data stream or blob.--mmapat all. It's an option in BSD grep