mass_rename.sh

#!/usr/bin/env bash

# Directory variables
# Where to start, in what directory.
start="/Users/ne/tmp/macnyt/music/"

# Subdir to look for.
sf="Soundfiles"
sb="soundbites"

# Let's move to working directory and get some work done.
cd ${start}

# find all files that end with /. Esentially this would give us directories.
for d in */; do
	# incremental indicator for files, being reset to 1 for each directory
	i=1

	# Let's test that we actually do have directory and not something else.
    if [ -d "$d" ]; then

		# Get catalog no from directory name
#		catno=$(echo ${d} | grep -oE '[0-9]+(?:-\d{2})?') # This regexp is not perfect yet...
		catno=$(echo ${d} | grep -oE '\d{3}\-\d{2}|\d{3}') # this regexp is not pretty but it works.
		# VERBOSE output for catalogID
		echo "Katalognummer:" "${catno}"
		
		# Catalog with multiple subfolders
		if [[ $catno == *"-"* ]]; then 
			catsubStart=${catno:0:3}
			catsubEnd=${catno:0:1}${catno:4:2}
			
			while [ $catsubStart -le $catsubEnd ]; do
				echo "  Underkatalog" ${catsubStart}
				cf=${start}${d}${sf}"/"${catsubStart}"/"${sb}
#				ls -lh "${cf}"
				j=1 # reset j to 1
				for x in "${cf}"/*; do
					if [ ${j} -lt 10 ] # if incremental indicator is less than 10 put leading zero in front the number.
					then 
						sli="0"${j}
					else
						sli=${j} # otherwise keep it as it was.
					fi
					
					mv "${x}" "${start}${d}${sf}"/"$catsubStart"/"${sb}"/"$catsubStart"-"${sli}".mp3""
					
					((j++))
				done
				
				((catsubStart++))
			done
			
			
			# figure a way to parse all subfolders between catno (eg: 611-12 = 611,612)
				
		else
			# Catalog with single folder

		# Find all files in subdir
		for f in "${d}"${sf}"/"${sb}/*; do
			# Let's make incremental a little bit more user friendly with leading zeroes, for sorting purposes.
			if [ ${i} -lt 10 ] # if incremental indicator is less than 10 put leading zero in front the number.
			then 
				li="0"${i}
			else
				li=${i} # otherwise keep it as it was.
			fi
			
			# Let's do the magic now.
			# Rename files so they are "catalogID-incrimental.mp3" and keep the structure.
#			echo "${start}${f}" "${start}${d}${sf}"/"${sb}"/"${catno}"-"${li}".mp3""
			mv "${start}${f}" "${start}${d}${sf}"/"${sb}"/"${catno}"-"${li}".mp3""
			# VERBOSE just to indicate how many files this catalog directory had renamed. Every "dot" is a single file.
			echo -n "."

			# increment indicators for each file found. 
			((i++))
		done
		
		fi 
		# VERBOSE create new line for new catalog output.
		echo ""
    fi
done