This Script Purges a Log Group but doesn't delete the Log Group. It Shows Current Progress and Confirms with you before deleting the streams

Log Group Purger

#!/usr/bin/env bash

LOG_GROUP_NAME=${1:?log group name is not set}

echo Getting stream names...
LOG_STREAMS=$(
    aws logs describe-log-streams \
        --log-group-name ${LOG_GROUP_NAME} \
        --query 'logStreams[*].logStreamName' \
        --output table |
        awk '{print $2}' |
        grep -v ^$ |
        grep -v DescribeLogStreams
)

echo These streams will be deleted:
printf "${LOG_STREAMS}\n"
echo Total $(wc -l <<<"${LOG_STREAMS}") streams
echo

while true; do
    read -p "Prceed? " yn
    case $yn in
    [Yy]*) break ;;
    [Nn]*) exit ;;
    *) echo "Please answer yes or no." ;;
    esac
done

for name in ${LOG_STREAMS}; do
    printf "Delete stream ${name}... "
    aws logs delete-log-stream --log-group-name ${LOG_GROUP_NAME} --log-stream-name ${name} && echo OK || echo Fail
done