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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
- Date: Fri, 22 Jan 2016 18:34:29 -0500
- 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>
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.
On Fri, Jan 22, 2016 at 6:21 PM, 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.
> 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?
> Ken Wolcott
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