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Binary search/replace

Terminal - Binary search/replace
xxd < orig | sed 's/A/B/' | sed 's/HEXA/HEXB/' | xxd -r > new
2009-02-05 20:25:04
User: wwest4
Functions: sed
3
Binary search/replace

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

Alternatives

There are 8 alternatives - vote for the best!

Terminal - Alternatives
xxd -p source | fold -w2 | paste -sd' ' | sed "s/A/B/g" | xxd -p -r > destination
2015-05-26 18:29:48
User: hincor
Functions: fold paste sed
Tags: sed xxd fold paste
2

Replace all instances of "A" with "B" in file "source" saved as file "destination".

!! IF A/B is multi-byte, then separate bytes with spaces like so: "s/20\ 0A/00/g".

Know a better way?

If you can do better, submit your command here.

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 $
Comment by unixmonkey6864 355 weeks and 4 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 "

Comment by edelbrp 340 weeks and 1 day 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.

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