This is for 32bits based offset detection with msf-pattern_offset -q ""

offset-finder.sh

#!/bin/bash

if [ $# -eq 0 ]
  then
    echo "No arguments supplied"
    exit 1
fi

w=$1

if [ ${#w} != '8' ]; then
	echo "it must be 8 bytes length like 0001020304"
	exit 1
fi

conv=$(printf "$1" | xxd -r -p)

f=${conv: 0:2}
s=${conv: 2:4}

k1=$(echo  -n $f | rev)
k2=$(echo  -n $s | rev)

word=$(printf "$k2$k1")

msf-pattern_offset -q "$word"