Post History

From [`man xxd`](https://linux.die.net/man/1/xxd), the section on the `-r` flag (emphasis added):

> -r | -revert
>
>    reverse operation: convert (or patch) hexdump into binary. If not writing to stdout, xxd writes into its output file without truncating it. **Use the combination -r -p to read plain hexadecimal dumps without line number information and without a particular column layout.** Additional Whitespace and line-breaks are allowed anywhere.