How to overwrite some bytes of a binary file with dd?

问题

I have a binary file and i want to replace the value A2 at address DEADBEEF with some other value, say A1.

How can I do this with dd? If there are other tools that can do this, please suggest. But I plan to do this on iPhone so I can only work with most basic Unix tools.

回答1:

printf '\xa1' | dd conv=notrunc of=somefile bs=1 seek=$((0xdeadbeef))

来源：https://stackoverflow.com/questions/7290816/how-to-overwrite-some-bytes-of-a-binary-file-with-dd