Process fails if current working directory is not writable

[TJM]

We are hoping to fix this problem internally with documentation, but we have seen this process fail when the user's shell was currently in a directory that they could not write to. I am not sure whether we should prefix the name of the CA certificate with ~/.kube or just ~/ or /tmp/whatever... long story short, if they are not in a writable directory when they copy/paste the steps, it will fail in ways that are not very clear.