s3 storage per bucket

s3_usage.sh

#!/bin/bash
# [email protected] 2020-02-07
# display S3 usage by bucket & type from cloudwatch billing info, not inspecting bucket itself
# requires aws-cli & jq

# usage ./s3_usage.sh profile 
# profile is optional, region follows from profile. s3 is region-less but cloudwatch isn't

if [ -z $1 ]; then
    PROFILE='default'
else
    PROFILE=$1
fi

# uses macosx gnu version of utils like numfmt, grep, etc.
if [[ $(uname -s) = *Darwin* ]]; then
    DATE='gdate'
    NUMFMT='gnumfmt'
    GREP='ggrep'
else
    DATE='date'
    NUMFMT='numfmt'
    GREP='grep'
fi
       
for type in "StandardStorage" "StandardIAStorage" "ReducedRedundancyStorage"
do echo "-$type-"
   for bucket in `aws --profile $PROFILE s3 ls | awk '{print $3}'`
   do aws --profile $PROFILE cloudwatch get-metric-statistics --namespace AWS/S3 \
	  --start-time $($DATE --date "Yesterday" +"%Y-%m-%dT00:00:00Z") --end-time $($DATE --date "Today" +"%Y-%m-%dT00:00:00Z") \
	  --period 86400 --statistics Average --metric-name BucketSizeBytes \
	  --dimensions Name=BucketName,Value=$bucket Name=StorageType,Value=$type \
	   | jq .Datapoints[].Average \
	   | $NUMFMT -z --to=iec --suffix=B && echo " $bucket"
   done | sort -rh | $GREP -vP '^ '
done