# switch to another cluster that's in kubeconfig
$ kubectx minikube
Switched to context "minikube".

# switch back to previous cluster
$ kubectx -
Switched to context "oregon".

# rename context
$ kubectx dublin=gke_ahmetb_europe-west1-b_dublin
Context "gke_ahmetb_europe-west1-b_dublin" renamed to "dublin".

# change the active namespace on kubectl
$ kubens kube-system
Context "test" set.
Active namespace is "kube-system".

# go back to the previous namespace
$ kubens -
Context "test" set.
Active namespace is "default".