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Re: Using Perl on Cygwin; how to prevent display of unwanted usage/error message?
- From: Andrey Repin <anrdaemon at yandex dot ru>
- To: Kenneth Wolcott <kennethwolcott at gmail dot com>, cygwin at cygwin dot com
- Date: Sat, 23 Jan 2016 15:52:24 +0300
- Subject: Re: Using Perl on Cygwin; how to prevent display of unwanted usage/error message?
- Authentication-results: sourceware.org; auth=none
- References: <CADex0xzfB3=aBJ7AgbTJ0hQKpmD0JSnX6xcjmu4fmqy284j5jw at mail dot gmail dot com>
- Reply-to: cygwin at cygwin dot com
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."
> "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
> 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,
Saturday, January 23, 2016 15:42:00
Sorry for my terrible english...
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