On Arch-based systems, xxd is part of the vim package.
xxd is a command-line utility that creates a hex dump of a given file or standard input. It can also convert a hex dump back into its original binary form. It is most commonly used for: Debugging binary files. Viewing non-printable characters. Patching executables. Why am I seeing "command not found"? xxd command not found
He felt a cold trickle down his spine. No internet. Two machines. No xxd . On Arch-based systems, xxd is part of the vim package