Here is such an example:

#!/bin/bash
confirm() { local ans IFS=; while read -rp "$1" -n1 ans; do printf '\n'; case $ans in [Yy]) return 0;; [Nn]) return 1;; esac; done; };
aws s3 ls | grep serverless | while read -r _ _ BUCKET
do
        if confirm "Execute $BUCKET" < /dev/tty
        then
                echo aws s3 rb --force s3://$BUCKET
        fi
done
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