Write a certain hex pattern to a file from bash

Question

I am trying to do some memory tests and am trying to write a certain hex pattern to a regular file from bash. How would I go about doing this without using the xxd or hexdump tool/command?

Thanks, Neco

Answer 1

The simplest thing is probably:

printf '\xde\xad\xbe\xef' > file

but it is often more convenient to do

perl -e 'print pack "H*", "deadbeef"' > file