Usage:

extkube --context ${K8S_CONTEXT}

This command will print:

Copied:
export KUBECONFIG="/var/folders/yz/7drt587x27g8cltqm8f1qfn80000gn/T/kubeconfig-2314541764"
to clipboard

and then you can paste that line into any terminal window, which will change KUBECONFIG only for this particular terminal window.

What happened under the hood:

1. A temporary file was created
2. kubeconfig with only 1 kube context was extracted from the active kubeconfig, usually it's ~/.kube/config. kubectl is not needed to be in $PATH
3. That extracted kubeconfig is written to this temporary file
4. The string in following form:

   export KUBECONFIG=$PATH_TO_THAT_TEMPORARY_FILE

   is copied into your clipboard.

You can just paste that command into your terminal to get "scoped" kube context. I used it for example when developing multi-cluster Kubernetes Operators.

extkube-rs git branch of this repository holds Rust implementation of this CLI tool, created for learning purposes.