Powershell Export to CSV from ForEach Loop - powershell

Question

I'm new to Powershell but I've given it my best go.
I'm trying to create a script to copy a file to the All Users Desktop of all the XP machines in an Array. The script basically says "If the machine is pingable, copy the file, if not, don't." I then want to export this information into a CSV file for further analysis.
I've set it all but no matter what I do, it will only export the last PC that it ran though. It seems to run through all the PC's (tested with outputting to a txt file) but it will not log all the machines to a CSV. Can anyone give any advise?
$ArrComputers = "PC1", "PC2", "PC3"
foreach ($Computer in $ArrComputers) {
$Reachable = Test-Connection -Cn $Computer -BufferSize 16 -Count 1 -ea 0 -quiet
$Output = #()
#Is the machine reachable?
if($Reachable)
{
#If Yes, copy file
Copy-Item -Path "\\servername\filelocation" -Destination "\\$Computer\c$\Documents and Settings\All Users\Desktop\filename"
$details = "Copied"
}
else
{
#If not, don't copy the file
$details = "Not Copied"
}
#Store the information from this run into the array
$Output =New-Object -TypeName PSObject -Property #{
SystemName = $Computer
Reachable = $reachable
Result = $details
} | Select-Object SystemName,Reachable,Result
}
#Output the array to the CSV File
$Output | Export-Csv C:\GPoutput.csv
Write-output "Script has finished. Please check output files."

Answer 1

The problem is this:
#Store the information from this run into the array
$Output =New-Object -TypeName PSObject -Property #{
SystemName = $Computer
Reachable = $reachable
Result = $details
} | Select-Object SystemName,Reachable,Result
}
#Output the array to the CSV File
$Output | Export-Csv C:\GPoutput.csv
Each iteration of your foreach loop saves to $Output. Overwriting what was there previously, i.e., the previous iteration. Which means that only the very last iteration is saved to $Output and exported. Because you are running PowerShell v2, I would recommend saving the entire foreach loop into a variable and exporting that.
$Output = foreach ($Computer in $ArrComputers) {
New-Object -TypeName PSObject -Property #{
SystemName = $Computer
Reachable = $reachable
Result = $details
} | Select-Object SystemName,Reachable,Result
}
$Output | Export-Csv C:\GPoutput.csv

Answer 2

You would want to append the export-csv to add items to the csv file
Here is an example
foreach ($item in $ITGlueTest.data)
{
$item.attributes | export-csv C:\organization.csv -Append
}

Answer 3

Here you go. This uses PSCustomObject which enumerates data faster than New-Object. Also appends to the .csv file after each loop so no overwriting of the previous data.
foreach ($Computer in $ArrComputers) {
$Reachable = Test-Connection -Cn $Computer -BufferSize 16 -Count 1 -ea 0 -quiet
#Is the machine reachable?
if($Reachable)
{
#If Yes, copy file
Copy-Item -Path "\\servername\filelocation" -Destination "\\$Computer\c$\Documents and Settings\All Users\Desktop\filename"
$details = "Copied"
}
else
{
#If not, don't copy the file
$details = "Not Copied"
}
#Store the information from this run into the array
[PSCustomObject]#{
SystemName = $Computer
Reachable = $reachable
Result = $details
} | Export-Csv C:\yourcsv.csv -notype -Append
}