AWS CLI: How to use variable to filter EFS

Question

I want to use the value of the DOMAIN_ID variable to filter the EFS to get a FileSystemId. I used the commands below. The first command works and it stores the domain ID. The second one returns an empty list, even though the DOMAIN_ID variable is present.

DOMAIN_ID=$(aws sagemaker list-domains --query 'Domains[0].DomainId')
aws efs describe-file-systems --query 'FileSystems[?CreationToken==`$DOMAIN_ID`].FileSystemId'

Output:

[]

Expected output:

<Some EFS identifier>

Answer 1

This works (escaping backticks) -

aws efs describe-file-systems --query "FileSystems[?CreationToken==\`$DOMAIN_ID\`].FileSystemId"

You can also use describe-domain command instead -

$ DOMAIN_ID=$(aws sagemaker list-domains --query 'Domains[0].DomainId' | tr -d '"')
$ aws sagemaker describe-domain --domain-id $DOMAIN_ID --query 'HomeEfsFileSystemId'