Today’s oneliner is for merging two kubectl configuration files into one. This can be useful when creating new clusters and exchanging small config files with your colleagues:
export KUBECONFIG=~/.kube/config.old:~/cluster
mv ~/.kube/config ~/.kube/config.old
kubectl config view --flatten > ~/.kube/config
Note the colon that seperates the filepaths in KUBECONFIG - you can pass in more than one file.