gke_versions command prints versions of all GKE Clusters and NodePool
container.clusters.list
See also: https://cloud.google.com/iam/docs/permissions-reference#container.clusters.list
Use Google Application Default Credentials
go get github.com/fregdee/gke_versoins$ gke_versions
+-----------------------------------------+-----------------+---------------------+------------------+
| CLUSTER NAME | CLUSTER VERSION | NODEPOOL NAME | NODEPOOL VERSION |
+-----------------------------------------+-----------------+---------------------+------------------+
| cluster1 | 1.17.15-gke.800 | default-pool | 1.17.13-gke.2001 |
+-----------------------------------------+ +---------------------+------------------+
| cluster2 | | default-pool | 1.17.15-gke.800 |
+-----------------------------------------+ +---------------------+------------------+
| cluster3 | | pool-20201005 | 1.17.12-gke.2502 |
+ + +---------------------+------------------+
| | | monitoring-20201005 | 1.17.12-gke.2502 |
+-----------------------------------------+ +---------------------+------------------+
| cluster4 | | default-pool | 1.17.9-gke.6300 |
+-----------------------------------------+-----------------+---------------------+------------------+