AWS CLI: ECR list-images, get newest

You can use describe-images instead.

aws ecr describe-images --repository-name foo 

returns imagePushedAt which is a timestamp property which you can use to filter.

I dont have examples in my account to test with but something like following should work

aws ecr describe-images --repository-name foo \
--query 'sort_by(imageDetails,& imagePushedAt)[*]'

If you want another flavor of using sort method, you can review this post

To add to Frederic's answer, if you want the latest, you can use [-1]:

aws ecr describe-images --repository-name foo \
--query 'sort_by(imageDetails,& imagePushedAt)[-1].imageTags[0]'

Assuming you are using a singular tag on your images... otherwise you might need to use imageTags[*] and do a little more work to grab the tag you want.

To get only latest image with out special character minor addition required for above answer.

aws ecr describe-images --repository-name foo --query 'sort_by(imageDetails,& imagePushedAt)[-1].imageTags[0]' --output text