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Date: Sat, 29 Aug 2015 22:15:38 -0700
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Subject: Re: [patch] "which"-builtin writes diagnostics to stdout
From: Bart Schaefer <schaefer@brasslantern.com>
To: Zsh hackers list <zsh-workers@zsh.org>
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On Sat, Aug 29, 2015 at 8:06 PM, Timo Buhrmester <fstd.lkml@gmail.com> wrote:
> When invoking the `which` builtin for something that does not exist, like:
>
> | % which doesnotexist
> | doesnotexist not found
>
> the "doesnotexist not found" message goes to standard output, rather than standard error.

Believe it or not, this is intentional, because the original "which"
builtin from csh does that.  Try it in tcsh, for example.