Merge multiple kubeconfig files, fish shell script

merge_kubeconfig_files.fish

# in order to use kubectx! (https://github.com/ahmetb/kubectx)

# Merge all kubeconfig files inside working directory
function merge_kubeconfig_files
    # concatenate file names with ':'
    # file1.conf:file2.conf:file3.conf
    set -x KUBECONFIG (string join ':' *.conf)
    kubectl config view --merge --flatten > merged_kubeconfig
    set -e KUBECONFIG
    mv merged_kubeconfig ~/.kube/config
    chmod o-r ~/.kube/config
    chmod g-r ~/.kube/config
    echo "merged all *.conf files into ~/.kube/config"
end

reference: https://stackoverflow.com/questions/46184125/how-to-merge-kubectl-config-file-with-kube-config