#!/bin/bash
# ------------------------------------------------------------
# File        : ChangeExt
# Author      : Jonathan Franzone
# Company     : http://www.franzone.com
# Date        : 09/05/2007
# Description : Bash script to change the file extension of
#               a group of files.
# ------------------------------------------------------------
 
# ------------------------------------------------------------
# Setup Environment
# ------------------------------------------------------------
 
# ------------------------------------------------------------
# User defined functions
# ------------------------------------------------------------
usage () {
	echo
	echo "Usage: `basename $0` <search dir> <old ext> <new ext>"
	echo
}
 
# ------------------------------------------------------------
# Check command-line arguments
# ------------------------------------------------------------
if [ -z "$3" ]; then
	usage
	exit 1
fi
 
# ------------------------------------------------------------
# Find the files and rename them
# ------------------------------------------------------------
OLDEXT=${2/#.}
NEWEXT=${3/#.}

find "${1}" -iname "*.${OLDEXT}" |
while read F
do
  NEWFILE="${F/%${OLDEXT}/${NEWEXT}}"
  echo "mv \"${F}\" \"${NEWFILE}\""
  mv -f "${F}" "${NEWFILE}"
done 
 
# ------------------------------------------------------------
# Done
# ------------------------------------------------------------
exit 0