Redirecting stderr to stdout through pipe doesn't work the way it does in Linux

Marco Atzeri
Tue Dec 4 20:52:00 GMT 2018

Am 04.12.2018 um 21:41 schrieb David Karr:
> "CYGWIN_NT-6.1 WACDTL03DK068X 2.9.0(0.318/5/3)"
> I installed a version of "kubectl" for windows, and I use it extensively in
> Cygwin bash for scripting command-line automation. In general, this works
> perfectly fine. I even use the same scripting in a Linux VM.
> I'm seeing an issue with one script that works fine in the Linux VM, but
> not in Cygwin.
> The command line is approximately this:
>       kubectl exec pod -c container -i -t -- grep "string"
> 2>&1 | sed -e 's/^propname=//'
> In Linux, this works perfectly fine.  In Cygwin, it says "stdout is not a
> tty".
> I haven't updated my local Cygwin installation for quite a while. I'd
> prefer not to, unless there is a strong chance this kind of thing would be
> fixed.

as kubectl is not a Cygwin program, it is not aware of cygwin pty.
You can try to use winpty to overcome the problem.

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