Uses ec2-describe-snapshots and ec2-delete-snapshot to order and delete snapshosts for a given account. to be used with https://gist.github.com/Aricg/5482068

gistfile1.sh

#!/bin/bash
numbertokeep=15

for zone in $(cat tmp_zones)
do


        for x in $(find /home/ubuntu/KEYS/* -type f | grep ".key");
        do
        key="--region "$zone" -C ${x%.*}.pem -K ${x%.*}.key"
        echo $key


        #if tmp_info is more than a day old. get it again
        #find -type f -name tmp_info  -mtime +1 -exec rm {} +
        rm tmp_info_snap
        if [[ ! -e tmp_info_snap ]]
        then
        #get the snaphot-id volume-id and date created of each snapshot
        ec2-describe-snapshots -o self $key  | grep SNAPSHOT | awk '{ print $2 " " $3 " " $5 }' | sed 's,\+.*,,g' |  sort -k2 > tmp_info_snap
        fi

        #gets volume-id we need to iterate throught these
        getvol() {
                        getvol=()
                         while read -d $'\n'; do
                                getvol+=("$REPLY")
                         done < <(cat tmp_info_snap | awk '{ print $2 }' | sort | uniq )
        }
        getvol "$@"

        #here we are a iteratin`
                for vol in "${getvol[@]}";
                do

                        #um. yeah. Im sorry...
                        #Vol is the field seperator, which redues the number of fields from 3 to 2, we print only lines that have 2 fields.
                        #next we use head - to keep $numbertokeep lines from being listed, anything else listed will get called for deletion. the final awk grabs the volume name and puts it in an array of variables "tbd"
                        for tbd in $(cat tmp_info_snap  | awk -v  volume="$vol" 'BEGIN { FS=volume;} {if (NF=="2") print $1 $2;}' | head -n -"$numbertokeep" | awk '{print $1}')
                                do
                                        echo "deleteing $tbd of $vol" >> /tmp/snaplog
                                        ec2-delete-snapshot $key "$tbd"
                                done
                done

        done

done