Hexdump to shellcode

hex_to_shellcode.sh

#!/bin/bash                    

# Translate hexdump output to ready_to_send shellcode

# C'EST PAS OPTI                                                                                                                      
# MAIS JE M'EN FOUS                                                                                                                   

to_shellcode()
{
    hexdump -x $1
    counter=0
    echo -n "TO CORRECT ENDIAN --> "

    echo -n "\""

    IFS=$'\n'                                               # Split for each line                                                     
    for line in `hexdump $1`; do                            # For each line in hexdump                                                

        IFS=" "                                             # Split for each space                                                    

        for byte in $(echo "$line" | cut -c 9-); do         # For each byte pair in line                                              
            echo -n "\x"
            echo -n $byte | cut -c 3- | awk '{printf $0}'   # Print the seconde one                                                   
            echo -n "\x"
            echo -n $byte | cut -c -2 | awk '{printf $0}'   # Print the first one                                                     
            counter=$((counter + 2))                        # MIGHT COUNT THE LAST NULL                                               
                                                            # BYTE IF ODD NUMBER OF BYTES                                             
        done
        IFS='\n'
    done

    echo "\""
    echo "Length: $counter"
}

if [ $# -le 0 ]
then
    echo "Usage: $0 NASM_FILE"
    exit 1
fi

to_shellcode $1