Something interesting I found out whilst following these instructions: My version of linux has two different echo commands `echo` and `/bin/echo`.

The basic one cannot accept any flags and when I type `echo "\x01"` it prints `\x01`

The one in bin can accept flags, and requires the -e flag to interpret backslashes.

This changes the echo line of the program to this:

`/bin/echo -e "\x01"`

I found this out because it was changing the byte from 00 to 5C rather than 01, because 5C is the ASCII for \