From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 24986 invoked by alias); 23 Jan 2016 00:04:41 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 24974 invoked by uid 89); 23 Jan 2016 00:04:40 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.3 required=5.0 tests=AWL,BAYES_40,FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,SPF_PASS autolearn=ham version=3.3.2 spammy=kennethwolcott@gmail.com, kennethwolcottgmailcom, H*i:sk:CACoZoo, H*f:sk:CACoZoo X-HELO: mail-yk0-f180.google.com Received: from mail-yk0-f180.google.com (HELO mail-yk0-f180.google.com) (209.85.160.180) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES128-GCM-SHA256 encrypted) ESMTPS; Sat, 23 Jan 2016 00:04:39 +0000 Received: by mail-yk0-f180.google.com with SMTP id s126so80213837ykf.2 for ; Fri, 22 Jan 2016 16:04:39 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:content-type; bh=5R46iFedMsOIFJyq7mmg0/Tq6/qnNFZZe4PXxoQJcWk=; b=YlpXRK5sRLe88zo6uC25yrHRlYC3+Agm4VFPeSam7F8kOHyOj48T9MJcI5o3fX61wI QxHDULcSntcZ4KsH2B5MV//n8yWEI4ccibIh4c6kMvBTelcgt5nj+NsqI3INZdVPgZt9 AkQzRB6OzVdwBD57BoX5/HDBnhzzAYcHGWJ03V4HgrLu1OH7eD80bVreJ59HwQz3MNWb wty0PELJkUidJALjYBdqOuQOOvuw9NGuKJyeZC1bZMk4am+n2tB18hltIRVlQ/+ZpdWI rx7lLqSMau3MCZsan84FnShjEYrx61ViHSbYNjv9xnlVg0njLnEDdAYq5ck1b0TK/zsn I5yg== X-Gm-Message-State: AG10YORODwjEnnvX6n+Z8p1DrdrWljivt/D5yJ/V6OL20V8QfP8Rrs5MbKTg1a0j+nR94/+pFN32PdzXiGhKCQ== MIME-Version: 1.0 X-Received: by 10.37.33.84 with SMTP id h81mr3213503ybh.166.1453507477641; Fri, 22 Jan 2016 16:04:37 -0800 (PST) Received: by 10.37.217.201 with HTTP; Fri, 22 Jan 2016 16:04:37 -0800 (PST) In-Reply-To: References: Date: Sat, 23 Jan 2016 14:25:00 -0000 Message-ID: Subject: Re: Using Perl on Cygwin; how to prevent display of unwanted usage/error message? From: Kenneth Wolcott To: cygwin@cygwin.com Content-Type: text/plain; charset=UTF-8 X-IsSubscribed: yes X-SW-Source: 2016-01/txt/msg00307.txt.bz2 > On Fri, Jan 22, 2016 at 6:21 PM, Kenneth Wolcott > 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 >> On Fri, Jan 22, 2016 at 3:34 PM, Erik Soderquist wrote: > 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 Hi Erik; Thank you! ">/dev/null 2>&1" solved the problem of hiding the information I did not want displayed. Thanks, Ken -- 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