#!/bin/bash

JAR=$1
path=`pwd`
unzip -d $JAR.tmp $JAR
pushd $JAR.tmp
for f in `find . -name '*.class'`; do
    out=`echo $f | cut -d. -f-2`
    java -jar $path/cfr_0_130.jar $f > $out.java
done
popd


Reference

http://www.benf.org/other/cfr/