Gets the size of the current folder's contents, as long as they're older than the year specified. Useful for scanning through a big directory, if you want to archive stuff older than x years. Ignores Thumbs.db and .DS_Store files.

sizeolderthan.sh

#!/bin/bash
# sizeolderthan.sh
# Usage: 
# To get total size of files older than 2013
# > sizeolderthan.sh 2013
# To get total size overall just take "du -h"...
#

maxyear=$1
if [ "$maxyear" == "" ]; then
    echo "No year provided."
    exit
fi
echo "Looking for folders older than ${maxyear}..."

total=0
while IFS= read -r -d $'\0' line; do
    newest=`find "${line}" -type f ! -name "Thumbs.db" ! -name ".DS_Store" -printf "%TY\n" | sort -nr | head -n 1`
    size=0
    if (( newest < maxyear && newest > 0 )); then
        # $line is a folder older than $maxyear
        size=`du -s "${line}" | awk '{ print $1 }'`
        total=$((total+size))
       echo -e "Total:\t${total}\t Size:\t${size}\t${line}"
    fi
done < <(find . -maxdepth 1 -type d -print0)
echo -e "================\nTotal:\t" `echo $total | awk '{ print $1/1000000, "GB" }'`