gistfile1.json

// aws cloudformation describe-stacks --region ap-southeast-2 | jq '.Stacks[] | select( .Parameters[0].ParameterValue == "s3://" ) | { StackId }'

{
            "StackId": "arn:aws:cloudformation:ap-southeast-2:xxxxxxx", 
            "Description": "Cache Cluster", 
            "Parameters": [
                {
                    "ParameterValue": "SecurityGroupWebCacheCluster", 
                    "ParameterKey": "SecurityGroup"
                }, 
                {
                    "ParameterValue": "SubnetGroupCacheWebProduction", 
                    "ParameterKey": "SubnetGroup"
                }, 
                {
                    "ParameterValue": "cache.m1.small", 
                    "ParameterKey": "NodeType"
                }, 
                {
                    "ParameterValue": "prod", 
                    "ParameterKey": "ApplicationEnvironment"
                }, 
                {
                    "ParameterValue": "xxxxxx-cache-prod", 
                    "ParameterKey": "Label"
                }
            ], 
            "Tags": [], 
            "Outputs": [
                {
                    "Description": "Cache cluster resource name", 
                    "OutputKey": "CacheClusterId", 
                    "OutputValue": "xxxxxx-cache-prod"
                }
            ], 
            "StackStatusReason": null, 
            "CreationTime": "2014-09-29T04:47:20.328Z", 
            "StackName": "core-xxxxxxx-cache-production", 
            "NotificationARNs": [], 
            "StackStatus": "CREATE_COMPLETE", 
            "DisableRollback": false
        }