Get WMI Data From Multiple Computers and Export to CSV - powershell

Question

So having some good old fashion Powershell frustrations today. What I need to do is this:
Get a list of computers from a file
Query those computers for "CSName" and "InstallDate" from Win32_OperatingSystem
Convert InstallDate into a useable date format.
Export all that to a .Csv
I've tried so many different iterations of my script. I run into 2 major issues. One is that I can't export and append to .Csv even with Export-Csv -Append. It just takes the first value and does nothing with the rest. The 2nd is that I can't get the datetime converter to work when piping |.
Here's a few samples of what I've tried - none of which work.
This sample simply errors a lot. Doesn't seem to carry $_ over from the WMI query in the pipe. It looks like it is trying to use data from the first pipe, but I'm not sure.
Get-Content -Path .\Computernames.txt | Foreach-Object {
gwmi Win32_OperatingSystem -ComputerName $_) |
Select-Object $_.CSName, $_.ConvertToDateTime($OS.InstallDate).ToShortDateString()
} | Export-Csv -Path Filename -Force -Append -NoTypeInformation
}
This one simply exports the first value and gives up on the rest when exporting .Csv
$Computers = Get-Content -Path .\Computernames.txt
foreach ($Computer in $Computers) {
echo $Computer
$OS = gwmi Win32_OperatingSystem -ComputerName $Computer
$OS | Select-Object
$OS.CSName,$OS.ConvertToDateTime($OS.InstallDate).ToShortDateString() |
Export-Csv -Path $Log.FullName -Append
}
This one does get the data, but when I try to select anything, I get null values, but I can echo just fine.
$OS = gwmi Win32_OperatingSystem -ComputerName $Computers
$OS | Foreach-Object {
Select-Object $_.CSName,$_.ConvertToDateTime($OS.InstallDate).ToShortDateString() |
Export-Csv -Path $Log.FullName -Force -Append -NoTypeInformation
}
This feels like it should be ridiculously simple. I can do this in C# with almost no effort, but I just can't get PS to do what I want. Any help would be much appreciated!

Answer 1

Here you go,
$Array = #() ## Create Array to hold the Data
$Computers = Get-Content -Path .\Computernames.txt
foreach ($Computer in $Computers)
{
$Result = "" | Select CSName,InstallDate ## Create Object to hold the data
$OS = Get-WmiObject Win32_OperatingSystem -ComputerName $Computer
$Result.CSName = $OS.CSName ## Add CSName to line1
$Result.InstallDate = $OS.ConvertToDateTime($OS.InstallDate).ToShortDateString() ## Add InstallDate to line2
$Array += $Result ## Add the data to the array
}
$Array = Export-Csv c:\file.csv -NoTypeInformation