Handy script for Java and JBoss developers and administrators - recursive ZIP/EAR/WAR/JAR exploder

This script, explode_zips.sh, taken straight from the document Aleksander Adamowski's useful scripts [1], should be very useful for a Java Enterprise application developer or administrator. It takes a ZIP archive (which JAR/WAR/EAR archives are in their heart, too) and recursively explodes it in a way similar to what the JBoss application server does when deploying. It's very useful e.g. when you have two versions of an enterprise application and want to compare them by content e.g. using diff. Comparing binary ZIP archives wouldn't do the trick, especially if they contain other archives, which contain another ones (you get the idea). On the other hand, when you recursively unpack all the archives and get rid of the binary ZIPs, you'll be left with a directory structure which can be easily compared for differences using appropriate tool (like the aforementioned diff on UNIX systems, or e.g. Total Commander under MS Windows). Here's the actual script:

#!/bin/sh
# Iteratively explode all ZIP/JAR/WAR/EAR archives in the current dir and all the archives they contain.

foundzips=1
while [ $foundzips -gt 0 ]; do
  IFS=$'\n'
  foundzips=0
  # Not very efficient to re-find for each sublevel, but it's simple:
  for zipfile in $(find ./ -type f -iname '*.zip' -or -iname '*.[jwe]ar'); do
    foundzips=1
    echo "Archive: [$zipfile]"
    expdir="$zipfile.exploded"
    if [ ! -e "$expdir" ]; then
      dirpushed=0
      zipfilebasename="$(basename "$zipfile")"
      echo "making $expdir" && \
      mkdir "$expdir" && \
      echo "entering $expdir" && \
      pushd "$expdir" && \
      dirpushed=1 && \
      echo "unzipping $PWD/../$zipfilebasename" && \
      unzip "../$zipfilebasename" && \
      echo "removing $PWD/../$zipfilebasename" && \
      rm "../$zipfilebasename" ||
      mv "../$zipfilebasename" "../$zipfilebasename.bad"
      if [ $dirpushed -gt 0 ]; then
        popd
      fi;
    fi;
    finish=0
  done;
done;