How to dump part of binary file

linux bash terminal dump
theta picture theta · Feb 26, 2012 · Viewed 14.1k times · Source

I have binary and want to extract part of it, starting from know byte string (i.e. FF D8 FF D0) and ending with known byte string (AF FF D9)

In the past I've used dd to cut part of binary file from beginning/ending but this command doesn't seem to support what I ask.

What tool on terminal can do this?

Answer

kev picture kev · Feb 26, 2012

Locate the start/end position, then extract the range.

$ xxd -g0 input.bin | grep -im1 FFD8FFD0  | awk -F: '{print $1}'
0000cb0
$ ^FFD8FFD0^AFFFD9^
0009590
$ dd ibs=1 count=$((0x9590-0xcb0+1)) skip=$((0xcb0)) if=input.bin of=output.bin

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