OPCODER

#!/bin/bash
#Obviously you need objdump and grep for this. Make sure egrep is an alias for grep -e
if [ $# -lt 1 ]; then
    echo "Please supply a parameter." 1>&2
    exit -1
fi
if [ ! -f ${1} ]; then
    echo "'${1}' is not a valid file." 1>&2
    exit -1
fi
SHOW=1
if [ $# -ge 2 ]; then
    if [[ "${2}" == "-q" ]]; then
        SHOW=0
    fi
fi
if [ $SHOW -eq 1 ]; then
    objdump -M intel -D $1
fi
LENGTH=0
ODUMP=`objdump -D $1`
SCODE=""
PLAIN=""
for i in `echo ${ODUMP}|tr '\t' ' '|tr ' ' '\n'|egrep '^[0-9a-f]{2}$' `; do SCODE="${SCODE}\\\\x${i}"; PLAIN=${PLAIN}${i}; LENGTH=$((LENGTH+1)); done
echo -e "\nShellcode:\n${SCODE}\n\nPlain:\n${PLAIN}\n\nLength: ${LENGTH} Bytes"
exit 0