check       check that an image has all content available locally

mike@mike-VirtualBox:~/go/src/github.com/containerd/containerd$ sudo bin/ctr i check --help
NAME:
   ctr images check - check existing images to ensure all content is available locally

USAGE:
   ctr images check [command options] [flags] [<filter>, ...]

DESCRIPTION:
   check existing images to ensure all content is available locally

OPTIONS:
   --quiet, -q          print only the ready image refs (fully downloaded and unpacked)
   --snapshotter value  snapshotter name. Empty value stands for the default value. [$CONTAINERD_SNAPSHOTTER]

mike@mike-VirtualBox:~/go/src/github.com/containerd/containerd$ sudo bin/ctr i check -q 
docker.io/library/busybox:latest
docker.io/library/nats-streaming:0.11.2
docker.io/library/redis:alpine

mike@mike-VirtualBox:~/go/src/github.com/containerd/containerd$ sudo bin/ctr i check name==docker.io/library/busybox:latest -q | wc -l
1
mike@mike-VirtualBox:~/go/src/github.com/containerd/containerd$ sudo bin/ctr i check name==docker.io/library/busybox:ss -q | wc -l
0