Recursively rename all files in a directory

renamemp3.sh

#!/bin/bash 
#
# Recursively rename all files in a directory with the following rules:
# - Convert letters to lower case
# - Convert whitespace to underscore
# - Remove 'track' in the name
#
# Used to clean up filenaming of mp3s
#
# Tim van Werkoven, 20100405 <[email protected]>
# This file is licensed under the Creative Commons Attribution-Share Alike
# license versions 3.0 or higher, see
# http://creativecommons.org/licenses/by-sa/3.0/

function rename {
	LOWER='abcdefghijklmnopqrstuvwxyz'
	UPPER='ABCDEFGHIJKLMNOPQRSTUVWXYZ'
	if [ -n "$1" ]; then cd $1; fi
	pwd
	for i in *; do
		j=`echo $i | sed s/\ /_/g | sed y/$UPPER/$LOWER/ | sed s/track//g`
		if [ ! "$i" = "$j" ]; then mv -- "$i" "$j"; fi
		if [ -d "$j" ]; then
			rename $j
			cd ..
			pwd
		fi
	done
}
	
rename $1