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Any reason Cygwin might prevent kubectl exec from showing shell prompt?

I really have no idea if this is a Cygwin problem, just trying to eliminate

I believe my Cygwin version is "2.9.0(0.318/5/3)" (from the uname string).

>From a mintty window, I use a variation of "kubectl exec" in a script to
run a shell in a container in a pod.  It appears to run, and I can run
processes from that shell in the container, but the curious thing is that I
never get a shell prompt from the container.  I thought I had gotten this
to work before, in the same k8s cluster, but I'm not certain.

The other curious thing I see is that if I execute "echo $PS1" in the shell
in the container, it gives me a reasonable response ("\w \$"), but if I
instead do "env | grep PS1", it returns nothing.

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