#Here is the full example with creating admin user and getting token:
#Creating a admin / service account user called k8sadmin
sudo kubectl create serviceaccount k8sadmin -n kube-system
#Give the user admin privileges
sudo kubectl create clusterrolebinding k8sadmin --clusterrole=cluster-admin --serviceaccount=kube-system:k8sadmin
#Get the token
sudo kubectl -n kube-system describe secret $(sudo kubectl -n kube-system get secret | (grep k8sadmin || echo "$_") | awk '{print $1}') | grep token: | awk '{print $2}'