batch-renaming.sh

#!/bin/bash
function help() {
	echo "batch-rename allows you to rename a bulk of filenames with RegEx"
	echo "usage: batch-rename -r [Search] [Replace]"
	echo "param -r: do effective renaming instead of just showing what would be done"
}

function dummyRename() {
	echo "simulate renaming \"$1\" to \"$2\""
	for file in * ; do echo "simulate: $file ->" "`echo $file | sed -E "s/$1/$2/g"`" ; done
}
function rename() {
	echo "rename \"$1\" to \"$2\""
	for file in * ; do mv -vf "$file" "`echo $file | sed -E "s/$1/$2/g"`" ; done
	echo "renaming done."
}

while [[ $# > 2 ]]
do
key="$1"
shift

case $key in
    -r|--rename)
    RENAME=YES
    ;;
    -e|--extension)
    EXTENSION="$1"
    shift
    ;;
    -s|--searchpath)
    SEARCHPATH="$1"
    shift
    ;;
    --default)
    DEFAULT=YES
    shift
    ;;
    *)
            # unknown option
    ;;
esac
done
# echo FILE EXTENSION  = "${EXTENSION}"

if [[ $2 ]]
then
	if [[ $RENAME ]]; then
		rename "$1" "$2"
	else
		dummyRename "$1" "$2"
	fi
else
	# show help
	help
fi