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Date: Fri, 22 Jan 2016 18:34:29 -0500
Message-ID: <CACoZoo3HLq1Zdfstta6_yK6-buy2Sp2GfaMmjp8Ec23bsbcuvA@mail.gmail.com>
Subject: Re: Using Perl on Cygwin; how to prevent display of unwanted usage/error message?
From: Erik Soderquist <ErikSoderquist AT gmail DOT com>
To: cygwin AT cygwin DOT com
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In cygwin, I use >/dev/null 2>&1 quite frequently and it works as expected.

In windows cmd.exe, I don't know why they would recommend the < part
for dealing with output, but I have used >NUL 2>&1 for the same effect
in Windows command shells.

-- Erik

On Fri, Jan 22, 2016 at 6:21 PM, Kenneth Wolcott
<kennethwolcott AT gmail DOT com> wrote:
> Hi;
>
>   I'm using a qx call to "net user username /DOMAIN" (probably should
> use system instead) to determine whether a person having an active
> account in an application is still an employee.
>
>   I get two messages back (error and/or usage) when a username is not found.
>
> "The user name could not be found."
>
> and
>
> "More help is available by typing NET HELPMSG 2221."
>
> I'd like to hide (not display, not print) these two messages.
>
> Coming from a UNIX/Linux background, I'd do a "2>&1 > /dev/null"
> operation to dispose of STDOUT and STDERR, but "1<&2 > NUL" (suggested
> by
>
> "https://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/redirection.mspx?mfr=true"
>
> does not seem to work.
>
>   I tried file descriptor 3, but that resulted in an error regarding
> unsupported file handle,. or something like that.
>
>   I was considering using IPC::Run3, but I don't think that will help
> with suppressing error message and usage message.
>
> Perhaps there is a Perl module that is native to Cygwin that will
> perform this kind of lookup for me?  Maybe a Perl module that is NOT
> native to Cygwin?
>
> Thanks,
> Ken Wolcott
>
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