Print an estimate of your current AWS bill, with the incremental change in the last 24 hours

aws-get-current-charges.sh

#! /usr/bin/env bash
# Print the current bill for each AWS account, with a total at the end
# for all accounts.
# ideas from and thanks to: 
#  https://medium.com/synaptic-tech/daily-aws-billing-alert-4ea541475ff8

set -eu

# Change "..." to contain the profile names of your AWS accounts.
identities="..."

function regions {
    aws --profile $1 ec2 describe-regions --output text | cut -f4
}

function charges_current {
    local profile=$1
    local region=$2
    aws --profile $profile --region $region cloudwatch get-metric-statistics \
	--namespace "AWS/Billing" \
	--metric-name "EstimatedCharges" \
	--dimension "Name=Currency,Value=USD" \
	--start-time $(date +"%Y-%m-%dT%H:%M:00" --date="-12 hours") \
	--end-time $(date +"%Y-%m-%dT%H:%M:00") \
	--statistic Maximum \
	--period 60 \
	--output text | tail -n +2 | sort -r -k 3 | head -n 1 | cut -f 2
}

function charges_dayago {
    local profile=$1
    local region=$2
    aws --profile $profile --region $region cloudwatch get-metric-statistics \
	--namespace "AWS/Billing" \
	--metric-name "EstimatedCharges" \
	--dimension "Name=Currency,Value=USD" \
	--start-time $(date +"%Y-%m-%dT%H:%M:00" --date="-24 hours") \
	--end-time $(date +"%Y-%m-%dT%H:%M:00" --date="-12 hours") \
	--statistic Maximum \
	--period 60 \
	--output text | tail -n +2 | sort -r -k 3 | head -n 1 | cut -f 2
}

{
grand_total=("0.0")
grand24_total=("0.0")
for id in $identities; do
    current_by_id=("0.0")
    dayago_by_id=("0.0")
    for r in $(regions $id); do
	current=$(charges_current $id $r)
	dayago=$(charges_dayago $id $r)
	# if empty respose then continue to next region
	[ "$current" ] || continue
	current_by_id+=(" + " "$current")
	dayago_by_id+=(" + " "$dayago")
    done
    current_total=$(echo ${current_by_id[@]} | bc -l)
    dayago_total=$(echo ${dayago_by_id[@]} | bc -l)
    diff24=$(echo $current_total - $dayago_total | bc -l)
    cat <<EOF
Current bill for account ${id}: \$$current_total (last 24hrs: \$$diff24)
EOF
    grand_total+=(" + " "$current_total")
    grand24_total+=(" + " "$dayago_total")
done
gt=$(echo ${grand_total[@]} | bc -l)
gt24=$(echo ${grand24_total[@]} | bc -l)
diff24=$(echo $gt - $gt24 | bc -l)

cat <<EOF

Total for all accounts: \$$gt (last 24hrs: \$$diff24)
EOF
exit 0
}