tag_all_buckets.sh

#!/bin/bash

# Get list of S3 buckets from AWS and cleaning the output
s3_bucket_list=$(aws s3api list-buckets --query "Buckets[].Name" | sed -e 's/[][]//g' -e 's/”//g' -e 's/,//g' -e '/^$/d' -e 's/^[ \t]*//;s/[ \t]*$//' -e 's/"//g')

# Loop through the list of S3 buckets and tag them
for bucket in $(echo "$s3_bucket_list")
do
    echo "Tagging: ${bucket}"
    aws s3api put-bucket-tagging --bucket "$bucket" --tagging "TagSet=[{Key=aws-cost-explorer,Value=$bucket}]"
done