Vista - Suppress output from a command line tool

I'm writing a script that wraps nslookup to gather DNS information from
multiple servers so I can confirm that they are in agreement.

Unfortunately, when nslookup runs it always returns the following error for
each lookup that I can't seem to suppress.

*** Can't find server name for address 204.74.113.1: No information

How can I get rid of this?

Here's a sample NSLookup command that I'm running:

nslookup blackbaud.com 204.74.112.1

If you run it, you can see there is plenty of other output, but only the
error message is displayed when executed in a script.

thanks for the help!

-Chris

have to tried piping the output to a file and then parsing the file

--
Richard Siddaway
Please note that all scripts are supplied "as is" and with no warranty
Blog: http://richardsiddaway.spaces.live.com/
PowerShell User Group: http://www.get-psuguk.org.uk


"Chris Harris" wrote:

> I'm writing a script that wraps nslookup to gather DNS information from
> multiple servers so I can confirm that they are in agreement.
>
> Unfortunately, when nslookup runs it always returns the following error for
> each lookup that I can't seem to suppress.
>
> *** Can't find server name for address 204.74.113.1: No information
>
> How can I get rid of this?
>
> Here's a sample NSLookup command that I'm running:
>
> nslookup blackbaud.com 204.74.112.1
>
> If you run it, you can see there is plenty of other output, but only the
> error message is displayed when executed in a script.
>
> thanks for the help!
>
> -Chris

Chris Harris wrote:
> I'm writing a script that wraps nslookup to gather DNS information from
> multiple servers so I can confirm that they are in agreement.
>
> Unfortunately, when nslookup runs it always returns the following error for
> each lookup that I can't seem to suppress.
>
> *** Can't find server name for address 204.74.113.1: No information
>
> How can I get rid of this?
>
> Here's a sample NSLookup command that I'm running:
>
> nslookup blackbaud.com 204.74.112.1
>
> If you run it, you can see there is plenty of other output, but only the
> error message is displayed when executed in a script.
>
> thanks for the help!
>
> -Chris

I'm struggling to determine exactly what you're looking to do.

If you try this:
91# $lookup=nslookup blackbaud.com 204.74.112.1
*** Can't find server name for address 204.74.112.1: No information

Then $lookup won't have that "No information" line, and use can use what
$lookup contains for whatever you're trying to do?

Marco

Thanks, Marco

I am using a variable to hold the results (and the variable doesn't contain
the error), but even when I do that the error message is displayed as in your
example below.

Thanks,
chris

"Marco Shaw" wrote:

> Chris Harris wrote:
> > I'm writing a script that wraps nslookup to gather DNS information from
> > multiple servers so I can confirm that they are in agreement.
> >
> > Unfortunately, when nslookup runs it always returns the following error for
> > each lookup that I can't seem to suppress.
> >
> > *** Can't find server name for address 204.74.113.1: No information
> >
> > How can I get rid of this?
> >
> > Here's a sample NSLookup command that I'm running:
> >
> > nslookup blackbaud.com 204.74.112.1
> >
> > If you run it, you can see there is plenty of other output, but only the
> > error message is displayed when executed in a script.
> >
> > thanks for the help!
> >
> > -Chris
>
> I'm struggling to determine exactly what you're looking to do.
>
> If you try this:
> 91# $lookup=nslookup blackbaud.com 204.74.112.1
> *** Can't find server name for address 204.74.112.1: No information
>
> Then $lookup won't have that "No information" line, and use can use what
> $lookup contains for whatever you're trying to do?
>
> Marco
>

"Chris Harris" <Chris Harris@discussions.microsoft.com> wrote in message
news:3391ADF9-59E6-45D4-88A6-1C052C97C734@microsoft.com...
> I'm writing a script that wraps nslookup to gather DNS information from
> multiple servers so I can confirm that they are in agreement.
>
> Unfortunately, when nslookup runs it always returns the following error
> for
> each lookup that I can't seem to suppress.
>
> *** Can't find server name for address 204.74.113.1: No information
>
> How can I get rid of this?
>
> Here's a sample NSLookup command that I'm running:
>
> nslookup blackbaud.com 204.74.112.1
>
> If you run it, you can see there is plenty of other output, but only the
> error message is displayed when executed in a script.

nslookup blackbaud.com 204.74.112.1 2>$null

will redirect the error stream output to $null i.e. will cause it to not be
displayed.

--
Keith

Hi Keith,
Redirecting to $null didn't seem to work as I still see the error message
and my $result variableis null as well

PS C:\Toolbox\Scripts\DNSCheck> $result = nslookup notices.dfwworld.org
i.root-s
ervers.net >$null
*** Can't find server name for address 192.36.148.17: No information
PS C:\Toolbox\Scripts\DNSCheck> $result
PS C:\Toolbox\Scripts\DNSCheck>

This has really got me stumped!

-Chris


"Keith Hill" wrote:

> "Chris Harris" <Chris Harris@discussions.microsoft.com> wrote in message
> news:3391ADF9-59E6-45D4-88A6-1C052C97C734@microsoft.com...
> > I'm writing a script that wraps nslookup to gather DNS information from
> > multiple servers so I can confirm that they are in agreement.
> >
> > Unfortunately, when nslookup runs it always returns the following error
> > for
> > each lookup that I can't seem to suppress.
> >
> > *** Can't find server name for address 204.74.113.1: No information
> >
> > How can I get rid of this?
> >
> > Here's a sample NSLookup command that I'm running:
> >
> > nslookup blackbaud.com 204.74.112.1
> >
> > If you run it, you can see there is plenty of other output, but only the
> > error message is displayed when executed in a script.
>
> nslookup blackbaud.com 204.74.112.1 2>$null
>
> will redirect the error stream output to $null i.e. will cause it to not be
> displayed.
>
> --
> Keith
>

"Chris Harris" <ChrisHarris@discussions.microsoft.com> wrote in message
news:3A7382B9-A457-47EE-86A0-BC9FCA24C3D4@microsoft.com...
> Hi Keith,
> Redirecting to $null didn't seem to work as I still see the error message
> and my $result variableis null as well
>
> PS C:\Toolbox\Scripts\DNSCheck> $result = nslookup notices.dfwworld.org
> i.root-s
> ervers.net >$null
> *** Can't find server name for address 192.36.148.17: No information
> PS C:\Toolbox\Scripts\DNSCheck> $result
> PS C:\Toolbox\Scripts\DNSCheck>

You have to have a "2" in front of the redirect operator. It tells
PowerShell to redirect only the stderr stream to null. Try it this way:

$result = nslookup notices.dfwworld.org i.root-servers.net 2>$null

--
Keith