Unable to add the Ping Response to Output variable - powershell

Question

I have written a script to export specific registry keys and the sub keys inside it with the server ping response, but my scripts works as expected but the ping response value when I add it to output it is giving null
Please help me to get the ping response value for each server.
## Clear the host
Clear-Host
## Install Export-Excel Module if it is not installed
If (-Not (Get-InstalledModule -Name ImportExcel)){
Install-Module -Name ImportExcel -ErrorAction SilentlyContinue -Force
}
## Set Script Location
Set-Location $PSScriptRoot
## Out File Name
$FileName = "$PSScriptRoot\TCPIP_Interface_Details.xlsx"
## Get full list of servers
$Servers = GC -Path ".\Servers.txt"
## Delete if Old file exists
if (Test-Path $FileName) { Remove-Item $FileName
write-host "$FileName has been deleted" -BackgroundColor DarkMagenta }
else { Write-host "$FileName doesn't exist" -BackgroundColor Red }
## Loop through each server
$Result = foreach ($vm in $Servers) {
## Check the Ping reponse for each server
Write-Host "Pinging Server" $vm
$Ping = Test-Connection -Server $vm -Quiet -Verbose
if ($Ping){Write-host "Server" $vm "is Online" -BackgroundColor Green}
else{Write-host "Unable to ping Server" $vm -BackgroundColor Red}
## Check the Network Share path Accessibility
Write-Host "Checking Share Path on" $vm
$SharePath = Test-Path "\\$vm\E$" -Verbose
if ($SharePath){Write-host "Server" $vm "Share Path is Accessible" -BackgroundColor Green}
else{Write-host "Server" $vm "Share path access failed" -BackgroundColor Red}
Invoke-Command -ComputerName $vm {
## Get ChildItems under HKLM TCPIP Parameter Interface
Get-ChildItem -Path 'HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces' | ForEach-Object {
Get-ItemProperty -Path $_.PSPath | Where-Object { $_.PsObject.Properties.Name -like 'Dhcp*' }
} | Select-Object -Property #{Name = 'ComputerName'; Expression = {$env:COMPUTERNAME+"."+$env:USERDNSDOMAIN}},
#{Name = 'Ping_Response'; Expression = {if($using:Ping) {'Pinging'} else {'Unable to ping'}}},
#{Name = 'Share_Path_Access'; Expression = {if($using:SharePath) {'Accessible'} else {'Not Accessible'}}},
DhcpIPAddress, #{Name = 'DhcpNameServer'; Expression = {$_.DhcpNameServer -split ' ' -join '; '}},
DhcpServer, #{Name = 'DhcpDefaultGateway'; Expression = {$_.DhcpDefaultGateway -join '; '}}
}}
$Result | Select-Object * -Exclude PS*, RunspaceId

Answer 1

As commented, just change your calculated property into
#{Name = 'Ping_Response'; Expression = {$using:Ping}}
By scoping the variable $Ping with using:, it will be known in the scriptblock for Invoke-Command. Without that, the scritblock simply sees it as new, undefined variable (i.e. $null)
If as you commented, you would rather see some text instead of just True or False, have the expression in that calculated property output whatever you want like:
#{Name = 'Ping_Response'; Expression = {if($using:Ping) {'Pinging'} else {'Unable to ping'}}}
Another way of letting the scriptblock know what $Ping is, is by adding this to the command as parameter:
Invoke-Command -ComputerName $vm {
param([bool]$Ping)
# ... the rest of the scriptblock
# now, you do not have to use the `using:` scope on $Ping
} -ArgumentList $Ping
To answer your latest comment, if pinging the machine did not work, there is really no reason to try and get properties from it using Invoke-Command. If you also want to have the non-pingables in your output, do:
$result = foreach ($vm in $Servers) {
$Ping = Test-Connection -Server $vm -Quiet -Verbose
if ($Ping) {
# we can reach this machine, so gather the properties we need and output an object
# the 'Ping_Response 'can now be hardcoded
Invoke-Command -ComputerName $vm -ScriptBlock {
Get-ChildItem -Path 'HKLM:\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces' | ForEach-Object {
Get-ItemProperty -Path $_.PSPath | Where-Object { $_.PsObject.Properties.Name -like 'Dhcp*' }
}
} |
Select-Object -Property #{Name = 'ComputerName'; Expression = {$_.PSComputerName}},
#{Name = 'Ping_Response'; Expression = { 'Pinging' }},
DhcpIPAddress,
#{Name = 'DhcpNameServer'; Expression = {$_.DhcpNameServer -split ' ' -join '; '}},
DhcpServer,
#{Name = 'DhcpDefaultGateway'; Expression = {$_.DhcpDefaultGateway -join '; '}}
}
else {
# return a similar object for machines that didn't respond to Ping
# since we cannot reach this machine, most properties will be empty
'' | Select-Object -Property #{Name = 'ComputerName'; Expression = {$vm}},
#{Name = 'Ping_Response'; Expression = { 'Unable to ping' }},
DhcpIPAddress,DhcpNameServer,DhcpServer,DhcpDefaultGateway
}
}
# output the results
$result | Select-Object * -ExcludeProperty PS*, RunspaceId | Export-Csv -Path "C:\temp\TCPIP_Interface_Details.csv" -NoTypeInformation