troubleshooting Question

How can I extract information from grouped records?

Avatar of Sam Jacobs
Sam JacobsFlag for United States of America asked on
Powershell
2 Comments1 Solution18 ViewsLast Modified:
I would like to create a report of the number of users coming in from a particular IP address and their subnet. Consider the following test data:
$users = @()
$users += [PSCustomObject]([ordered]@{Name='Adam';IP='192.168.4.1';subnet='192.168.4.x'})
$users += [PSCustomObject]([ordered]@{Name='Tony';IP='192.168.5.20';subnet='192.168.5.x'})
$users += [PSCustomObject]([ordered]@{Name='Cheryl';IP='192.168.4.1';subnet='192.168.4.x'})
$users += [PSCustomObject]([ordered]@{Name='Bob';IP='192.168.3.5';subnet='192.168.3.x'})
$users += [PSCustomObject]([ordered]@{Name='Sandy';IP='192.168.5.20';subnet='192.168.5.x'})

$users

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This creates my array of users:
Users.png
Grouping the above by Subnet and IP should give me a report something like this:
Users2.png
So I use the Group-Object cmdlet:
$counts = $users | group subnet, IP
$counts

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and that produces this:
User3.png
Now, I can do this:
Write-Host "$($Counts[0].Group[0].Subnet)       $($Counts[0].Group[0].IP)      $($counts[0].Count)"
Write-Host "$($Counts[1].Group[0].Subnet)       $($Counts[1].Group[0].IP)      $($counts[1].Count)"
Write-Host "$($Counts[2].Group[0].Subnet)       $($Counts[2].Group[0].IP)      $($counts[2].Count)"

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which will correctly output what I expect:
192.168.4.x       192.168.4.1        2
192.168.5.x       192.168.5.20      2
192.168.3.x       192.168.3.5        1

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But if I do this (which I would expect is the same thing):

 $counts | ForEach {
    Select -Property {
            @{n='Subnet'; e={$_.Group[0].Subnet}},
			@{n='IP Address'; e={$_.Group[0].IP}},
			@{n='# Users'; e={$_.Group[0].Count}}
    }
}

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I don't get any output.
What am I doing wrong?
Thanks.
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