Write byte at address (hexedit/modify binary from the command line)

Question

Is there any straightforward way to modify a binary from the commandline? Let\'s say I know that my binary contains 1234abcd and i want to change it to 12FFabcd or FFFFabcd

Answer 1

Some alternatives:

• HexAlter (open source compiled tool)
• ucon64 --nbak --poke=OFF:V FILE (meant for ROM dumps, should work with any binary file, but no inplace editing)
• printf '\x31' | dd of=FILE bs=1 seek=OFFSET count=1 conv=notrunc (wrapped in a shellscript like this that also allows reading)