#!/bin/bash

process_file() {
    echo "Processing $1"
    # echo -n "First 100 bytes of $file: "
    #  | od -An -t x1
    # dd bs=1 count=100 if="$file" 2>/dev/null
    dd bs=1 count=100 if="$1" >/dev/null 2>&1
}

export -f process_file

if [ "$#" -ne 1 ]; then
    echo "Usage: $0 directory"
    exit 1
fi

if [ ! -d "$1" ]; then
    echo "Directory $1 does not exist."
    exit 1
fi

find "$1" -type f -print0 | xargs -0 -n1 -P20 -I{} bash -c 'process_file "$@"' _ {}