How to export two variables into same CSV as joined via PowerShell? - powershell

Question

I have a PowerShell script employing poshwsus module like below:
$FileOutput = "C:\WSUSReport\WSUSReport.csv"
$ProcessLog = "C:\WSUSReport\QueryLog2.txt"
$WSUSServers = "C:\WSUSReport\Computers.txt"
$WSUSPort = "8530"
import-module poshwsus
ForEach ($Server in Get-Content $WSUSServers)
{
& connect-poshwsusserver $Server -port $WSUSPort | out-file $ProcessLog -append
$r1 = & Get-PoshWSUSClient | select #{name="Computer";expression={$_.FullDomainName}},#{name="LastUpdated";expression={if ([datetime]$_.LastReportedStatusTime -gt [datetime]"1/1/0001 12:00:00 AM") {$_.LastReportedStatusTime} else {$_.LastSyncTime}}}
$r2 = & Get-PoshWSUSUpdateSummaryPerClient -UpdateScope (new-poshwsusupdatescope) -ComputerScope (new-poshwsuscomputerscope) | Select Computer,NeededCount,DownloadedCount,NotApplicableCount,NotInstalledCount,InstalledCount,FailedCount
}
What I need to do is to export CSV outpout including the results with the columns (like "inner join"):
Computer, NeededCount, DownloadedCount, NotApplicableCount, NotINstalledCount, InstalledCount, FailedCount, LastUpdated
I have tried to use the line below in foreach, but it didn't work as I expected.
$r1 + $r2 | export-csv -NoTypeInformation -append $FileOutput
I appreciate if you may help or advise.
EDIT --> The output I've got:
ComputerName LastUpdate
X A
Y B
X
Y
So no error, first two rows from $r2, last two rows from $r1, it is not joining the tables as I expected.
Thanks!

Answer 1

I've found my guidance in this post: Inner Join in PowerShell (without SQL)
Modified my query accordingly like below, works like a charm.
$FileOutput = "C:\WSUSReport\WSUSReport.csv"
$ProcessLog = "C:\WSUSReport\QueryLog.txt"
$WSUSServers = "C:\WSUSReport\Computers.txt"
$WSUSPort = "8530"
import-module poshwsus
function Join-Records($tab1, $tab2){
$prop1 = $tab1 | select -First 1 | % {$_.PSObject.Properties.Name} #properties from t1
$prop2 = $tab2 | select -First 1 | % {$_.PSObject.Properties.Name} #properties from t2
$join = $prop1 | ? {$prop2 -Contains $_}
$unique1 = $prop1 | ?{ $join -notcontains $_}
$unique2 = $prop2 | ?{ $join -notcontains $_}
if ($join) {
$tab1 | % {
$t1 = $_
$tab2 | % {
$t2 = $_
foreach ($prop in $join) {
if (!$t1.$prop.Equals($t2.$prop)) { return; }
}
$result = #{}
$join | % { $result.Add($_,$t1.$_) }
$unique1 | % { $result.Add($_,$t1.$_) }
$unique2 | % { $result.Add($_,$t2.$_) }
[PSCustomObject]$result
}
}
}
}
ForEach ($Server in Get-Content $WSUSServers)
{
& connect-poshwsusserver $Server -port $WSUSPort | out-file $ProcessLog -append
$r1 = & Get-PoshWSUSClient | select #{name="Computer";expression={$_.FullDomainName}},#{name="LastUpdated";expression={if ([datetime]$_.LastReportedStatusTime -gt [datetime]"1/1/0001 12:00:00 AM") {$_.LastReportedStatusTime} else {$_.LastSyncTime}}}
$r2 = & Get-PoshWSUSUpdateSummaryPerClient -UpdateScope (new-poshwsusupdatescope) -ComputerScope (new-poshwsuscomputerscope) | Select Computer,NeededCount,DownloadedCount,NotApplicableCount,NotInstalledCount,InstalledCount,FailedCount
Join-Records $r1 $r2 | Select Computer,NeededCount,DownloadedCount,NotApplicableCount,NotInstalledCount,InstalledCount,FailedCount, LastUpdated | export-csv -NoTypeInformation -append $FileOutput
}

Answer 2

I think this could be made simpler. Since Select-Object's -Property parameter accepts an array of values, you can create an array of the properties you want to display. The array can be constructed by comparing your two objects' properties and outputting a unique list of those properties.
$selectProperties = $r1.psobject.properties.name | Compare-Object $r2.psobject.properties.name -IncludeEqual -PassThru
$r1,$r2 | Select-Object -Property $selectProperties
Compare-Object by default will output only differences between a reference object and a difference object. Adding the -IncludeEqual switch displays different and equal comparisons. Adding the -PassThru parameter outputs the actual objects that are compared rather than the default PSCustomObject output.