Binary search/replace

xxd < orig | sed 's/A/B/' | sed 's/HEXA/HEXB/' | xxd -r > new
Replaces A with B in binary file "orig" and saves the result to "new". You must have the hex representations of A & B. Try od: echo -e "A\c" | od -An -x

By: wwest4
2009-02-05 20:25:04

1 Alternatives + Submit Alt

What Others Think

By default xxd creates a formatted hex dump, which will cause this command to miss instances where the string wraps to a new line. Use the -p option instead to skip formatting: xxd -p < orig | sed 's/HEXA/HEXB/' | xxd -r -p > new $
unixmonkey6864 · 606 weeks and 3 days ago
This has a few problems still. Inefficient for large files, doesn't align on byte boundries and xxd -p still has new-lines so wrapped hex won't get matched. You can use Perl's RE to do hex matches for you by using the \x{XX} expression where "XX" is the hex byte code. For example: perl -pe 's/\x{3C}\x{21}/\x{3D}/g;s/\x{2D}/\x{3D}/g' < orig > new This replaces "
edelbrp · 591 weeks ago
Oops, the end of my comment got truncated. Anyways, you can look up 0x3C,0x21, etc. to see what chars I'm replacing and with what in my example above.
edelbrp · 591 weeks ago
`xxd -p < orig | sed 's/HEXA/HEXB/' | xxd -r -p > new` is more correct and simpler! Also if you want to do an in-place edit, you can use `sponge` to help you out. `xxd -p < orig | sed 's/HEXA/HEXB/' | xxd -r -p | sponge orig` This works because `sponge` doesn't open the file until all the work is done. You can find it in the moreutils package.
varenc · 84 weeks and 6 days ago
1st. I think some folks meant s/before/after/g and not s/before/after. 2nd. I don't see any of these sed solutions working because sed is line oriented by nature and arbitrarily stops scanning when a line greater than 8K shows up. (Linux Mint 18.03) For larger files, the only sed-like solution I've found was bbe ("Binary Block Editor"). It's a *very* sed-like replacement. Or you can struggle with Perl, which will likely make you a meth addict eventually.
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What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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