kubectl get pods --all-namespaces | grep Terminating | xargs -n 1 | grep onap- | kubectl delete pod -n onap --grace-period=0 --force

    if [ "$BRANCH" == "master" ]; then
      kubectl delete namespace $ENVIRON
      sudo helm delete --purge dev
    else
      oom/kubernetes/oneclick/deleteAll.bash -n $ENVIRON
    fi

    sleep 1
    # verify
    DELETED=$(kubectl get pods --all-namespaces -a | grep 0/ | wc -l)
    echo "verify deletion is finished."
    while [  $(kubectl get pods --all-namespaces | grep 0/ | wc -l) -gt 0 ]; do
      sleep 15
      echo "waiting for deletions to complete"
    done
    # wait for 0/1 before deleting
    echo "sleeping 30 sec"
    # delete potential hanging clustered pods
    kubectl delete pod $ENVIRON-aaf-sms-vault-0 -n $ENVIRON --grace-period=0 --force
    kubectl delete pod $ENVIRON-aai-cassandra-0 -n $ENVIRON --grace-period=0 --force
    kubectl delete pod $ENVIRON-aai-cassandra-1 -n $ENVIRON --grace-period=0 --force
    kubectl delete pod $ENVIRON-aai-cassandra-2 -n $ENVIRON --grace-period=0 --force

ran
ubuntu@ip-10-0-0-19:~$ kubectl delete namespace onap
Error from server (NotFound): namespaces "onap" not found
ubuntu@ip-10-0-0-19:~$  helm ls --all onap
NAME	REVISION	UPDATED                 	STATUS  	CHART     	NAMESPACE
onap	1       	Fri May  4 19:17:30 2018	DEPLOYED	onap-2.0.0	onap     
ubuntu@ip-10-0-0-19:~$ helm del --purge onap
release "onap" deleted