cmp_bytes.sh

#!/bin/bash
#./cmp_bytes PoC
#Author:    hecky
#Web:       Neobits.org
#Twitter:   @hecky
#Mail:      [email protected]

file1=$1
file2=$2

if [ $(echo $#) -ne 2 ]; then echo -e "./cmp_bytes.sh file1 file2\n\n\t<<< \e[1;31m@hecky\e[m from \e[1;36mNeobits.org\e[m >>>" ; exit ;fi

declare -a bytes1=( $(xxd -p "$file1" | fold -2 ) )
declare -a bytes2=( $(xxd -p "$file2" | fold -2 ) )

let size1=$(du -b "$file1" | cut -f1)
let size2=$(du -b "$file2" | cut -f1)

if [ $size1 -ne $size2 ]; then
    alert="different"
    if [ $size1 -gt $size2 ]; then
        let size=$size1
    else
        let size=$size2
    fi
else
    #Just for fun :P
    let size=$((($size1+$size2)/2))
fi

if [[ -a $file1".hex" && -a $file2".hex" ]]; then rm -rf $file1".hex" $file2".hex" ;fi

let count=0

if [[ $alert != "different" ]];then
    for ((i=0;i<$size;i++));do
        if [ "${bytes1[$i]}" != "${bytes2[$i]}" ]; then
            let $((count++))
            echo -e "Byte  \e[1;36m"$(($i+1))"\e[m:\t"${bytes1[$i]}" - "${bytes2[$i]}
            (printf $(echo -n "\x"${bytes1[$i]}) >> $file1".hex") &> /dev/null
            (printf $(echo -n "\x"${bytes2[$i]}) >> $file2".hex") &> /dev/null
        fi
    done
else
        for ((i=0;i<$size;i++));do
        if [ "${bytes1[$i]}" != "${bytes2[$i]}" ]; then
            let $((count++))
            echo -e "Byte  \e[1;36m"$(($i+1))"\e[m:\t"${bytes1[$i]}" - "${bytes2[$i]}
            if [[ ${bytes1[$i]} == "" ]];then
                (printf $(echo -n "\x"${bytes2[$i]}) >> $file2".hex") &> /dev/null
            elif [[ ${bytes2[$i]} == "" ]];then
                (printf $(echo -n "\x"${bytes1[$i]}) >> $file2".hex") &> /dev/null
            else
                (printf $(echo -n "\x"${bytes1[$i]}) >> $file1".hex") &> /dev/null
                (printf $(echo -n "\x"${bytes2[$i]}) >> $file2".hex") &> /dev/null
            fi
        fi
    done
fi

echo -e "\n\e[1;4;31m$count\e[m bytes diferentes"
echo -e "\nSe han guardado los bytes diferentes en \e[1;33m$file1.hex\e[m y \e[1;33m$file2.hex\e[m\n\n\t<<< \e[1;31m@hecky\e[m from \e[1;36mNeobits.org\e[m >>>"