on-tree

#!/bin/bash

if [ $# -ne 5 ]; then
  echo "Usage: $0 dir-in dir-out ext-in ext-out cmd" >&2
  echo "Eg: $0 foo-d bar-d .xml .txt foo2text" >&2
  exit 1
fi

DIR_IN=$1
DIR_OUT=$2
EXT_IN=$3
EXT_OUT=$4
CMD=$5

pushd $DIR_IN > /dev/null
DIRS=`find . -type d`
FILES=`find . -name '*'$EXT_IN`
popd > /dev/null

mkdir $DIR_OUT
for d in $DIRS; do
  mkdir $DIR_OUT/$d
done

for i in $FILES; do
  $CMD "$DIR_IN/$i" > $DIR_OUT/`dirname $i`/`basename $i $EXT_IN`$EXT_OUT
done
~