cfn-signal --success|-s signal.to.send \
--reason|-r resource.status.reason \
--data|-d data \
--id|-i unique.id \
--exit-code|-e exit.code \
waitconditionhandle.url
--access-key access.key \
--credential-file|-f credential.file \
--exit-code|-e exit.code \
--http-proxy HTTP.proxy \
--https-proxy HTTPS.proxy \
--id|-i unique.id \
--region AWS.region \
--resource resource.logical.ID \
--role IAM.role.name \
--secret-key secret.key \
--stack stack.name.or.stack.ID \
--url AWS CloudFormation.endpoint