Bash script to get last 3 months of AWS charges, and forecast for current month charges

aws_cost_report

#!/usr/bin/env bash

set -euo pipefail

TODAY="$(date "+%Y-%m-%d")"
NEXTM="$(date -v+1m "+%Y-%m-%d")"
THREE="$(date -v-3m "+%Y-%m-%d")"
BEGIN="${THREE:0:8}01"
END="${NEXTM:0:8}01"

COST_TIME_PERIOD='{"Start":"'${BEGIN}'","End":"'${TODAY}'"}'
ESTIMATE_TIME_PERIOD='{"Start":"'${TODAY}'","End":"'${END}'"}'

COST_Q='.ResultsByTime[]|"\(.TimePeriod.Start),\(.TimePeriod.End),\(.Total.BlendedCost.Unit),\(.Total.BlendedCost.Amount|tonumber|.*pow(10;2)|round/pow(10;2)),Cost"'
# shellcheck disable=SC2016
EST_Q='.Total.Unit as $unit | .ForecastResultsByTime[]|"\(.TimePeriod.Start),\(.TimePeriod.End),\($unit),\(.MeanValue|tonumber|.*pow(10;2)|round/pow(10;2)),Forecast"'

>&2 echo -en "\033[31;40mThis will cost \$0.02; continue?\033[0m "
read -n 1 -r REPLY

if [[ ! $REPLY =~ ^[Yy]$ ]]; then :
else

  aws ce get-cost-and-usage \
    --time-period "${COST_TIME_PERIOD}" \
    --metric "BLENDED_COST" \
    --granularity "MONTHLY" \
    --output json | jq -r "${COST_Q}"

  aws ce get-cost-forecast \
    --time-period "${ESTIMATE_TIME_PERIOD}" \
    --metric "BLENDED_COST" \
    --granularity "MONTHLY" \
    --output json | jq -r "${EST_Q}"

fi