#!/bin/bash

#
# EXAMPLES:
# ./keh_renamepdf.txt 1970 1970
#This script will rename .PDF to .pdf


if [ -z "$1" ]; then
        echo "ERROR: no start year specified"
        echo "This script expects to be run from a top level directory, with folders of the form YYYY/MM below it"
        echo "USAGE: ${0} <start_year> <stop_year>"
        echo "EXAMPLE: ${0} 1980 1982"
fi

if [ -z "$2" ]; then
        echo "ERROR: no stop year specified"
        echo "This script expects to be run from a top level directory, with folders of the form YYYY/MM below it"
        echo "USAGE: ${0} <start_year> <stop_year>"
        echo "EXAMPLE: ${0} 1980 1982"
fi

start_year="${1}"
stop_year="${2}"

for yr in `seq ${start_year} ${stop_year}`
do
 	cd $yr
	echo "$yr"
        for mo in `seq -w 01 12`
        do
		cd $mo
		echo "$mo"
		files=`ls *.PDF`
		for f in ${files[*]}
		do
			echo "renaming $f ${f%.PDF}.pdf"
			mv $f ${f%.PDF}.pdf
		done
		cd ..
	done
	cd ..
done