S3 versioned bucket object diff

s3vd.sh

#!/bin/bash

# s3vd [bucket] [object] [v1 index] [v2 index]

bucket=${1:-bucket-name} 
object=${2:-default-object}
get_object="aws s3api get-object --bucket $bucket --key $object"
v1=${3:-0}
v2=${4:-1}

version_list=$(aws s3api list-object-versions --bucket $bucket --prefix $object)
v1_obj=$(echo $version_list | jq -r --argjson v $v1 '.[] | nth($v)')
v2_obj=$(echo $version_list | jq -r --argjson v $v2 '.[] | nth($v)')

diff \
	<($get_object --version-id $(echo $v1_obj | jq -r .VersionId) /dev/stdout) \
	<($get_object --version-id $(echo $v2_obj | jq -r .VersionId) /dev/stdout)