`xxd` is a Linux Hexdump command
On the Linux platform, the command xxd (available via most package managers) works as a hexdump tool.
From man xxd
xxd creates a hex dump of a given file or standard input. It can also
convert a hex dump back to its original binary form. Like uuencode(1) and
uudecode(1) it allows the transmission of binary data in a `mail-safe' ASCII
representation, but has the advantage of decoding to standard output.
Moreover, it can be used to perform binary file patching.
