Get a list of currently running Pod names:
$ kubectl get pods -o go-template --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}'
SSH directly into a pod:
$ kubectl exec --namespace <namespace_name> -it <pod_name> -- bash
Multiple configs?
$ export KUBECONFIG=$PATH
Describe all contexts:
$ kubectl config get-contexts
Switching contexts:
$ kubectl config use-context gcloud-us-east1-k8s
List pods (all namespaces):
$ kubectl get pods -o json --all-namespaces