X-Recipient: archive-cygwin AT delorie DOT com DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:date:from:reply-to:message-id:to:subject :in-reply-to:references:mime-version:content-type :content-transfer-encoding; q=dns; s=default; b=DL70oXLoqCgxCvxh cVT/5eIMnrUgxm/+5J399Fe1ctgoA0AZFIjrm7DC7HY3Kj+OYT3RjsCg/yaZH/w8 KP+T+JHI3ozkgUC47mSguByIu46Ac/HNwHzNE9RlzESErektgzddAy2cuiFXV4pK Hr+BEoUo6qC3KZjWzeTDcu6qrYo= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sourceware.org; h=list-id :list-unsubscribe:list-subscribe:list-archive:list-post :list-help:sender:date:from:reply-to:message-id:to:subject :in-reply-to:references:mime-version:content-type :content-transfer-encoding; s=default; bh=dqG+vBMxU2eie98q0/qFtr RCj/Q=; b=YCkNT6DD9w5CsnEmkrfEWFemjwqmmMrjJDTbY6xZxhhyfTgoIel+Rw sPK1Rk0qcwRCA3cBsXzNPHrL3AgjHGbHslIxozMwkHJQYMN1w5TfTZyGhglPsn5g /qPEdsuvBOXaCrtO0wK34bbsqkDWEQN0HjBVtFYM8H0MmolkplHfU= Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: Yes, score=5.8 required=5.0 tests=AWL,BAYES_50,FREEMAIL_FROM,KAM_THEBAT,RCVD_IN_PSBL,SPF_SOFTFAIL autolearn=no version=3.3.2 spammy=H*UA:Bat!, H*x:Bat!, H*UA:Home, H*x:Home X-HELO: smtp.ht-systems.ru Date: Sat, 23 Jan 2016 15:52:24 +0300 From: Andrey Repin Reply-To: cygwin AT cygwin DOT com Message-ID: <862202948.20160123155224@yandex.ru> To: Kenneth Wolcott , cygwin AT cygwin DOT com Subject: Re: Using Perl on Cygwin; how to prevent display of unwanted usage/error message? In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Greetings, Kenneth Wolcott! > 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. That's... I don't know how to qualify this article, but it's just doesn't quite work that way. The semantics of redirection are same on Windows as on Linux. net user username /DOMAIN > /dev/null 2>&1 or, under native shell (cmd) net user username /DOMAIN > nul: 2>&1 > 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? Another solution is to assign your own handles to the underlying process, but considering you don't want the output at all, I don't see it viable. -- With best regards, Andrey Repin Saturday, January 23, 2016 15:42:00 Sorry for my terrible english... -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple