How to get local variable value from Invoke-command -Asjob?

Question

I want to run [System.Net.Dns]::GetHostAddresses("mail") on remote computers and write it.

Foreach($PCName in $PCNameArray) {
    $arrayJobs += Invoke-Command -Credential $cred -scriptblock { 
                param (
                    [String]$ip                )
                $IPs = [System.Net.Dns]::GetHostAddresses("mail")
                $ip = $ips[0]
    } -ComputerName $PCName -AsJob -ArgumentList $ip
}

Wait-Job $arrayJobs

$ResultArray=[System.Collections.ArrayList]@()

foreach ($job in $arrayJobs) {
    if ($job.State -eq 'Completed') {
        $ResultArray += Receive-Job $job
    } 
    Stop-Job $job
}

$ResultArray | Select PsComputerName,ip | Export-Csv $OutputFile -NoTypeInformation -Delimiter ';' -Encoding UTF8

How can get $ip value from inside Invoke-Command for all jobs?

Change $ip = $ips[0] to just $ips[0], or $ips |Select-Object -First 1 — Mathias R. Jessen
– Mathias R. Jessen, Commented Jul 28, 2023 at 8:26
I asked about something else, sorry if I confused you... I just want know IP of "mail" host inside of every job, and get this parameter to outside, to some $ResultArray jobs array, from where for example I want get: for Job1 - $Resultarray.PSComputername=Host1, Resultarray.IP=192.168.100.1 for Job2 - $Resultarray.PSComputername=Host2, Resultarray.IP=192.168.100.3 for Job3 - $Resultarray.PSComputername=Host3, Resultarray.IP=192.168.100.1 something like this — Ruslannnn
– Ruslannnn, Commented Jul 28, 2023 at 9:10
Yup, I understood that. Did you try what I suggested? You'll need to change Select PSComputerName,ip to Select PSComputerName,@{Name='ip';Expression='IPAddressToString'} also :) — Mathias R. Jessen
– Mathias R. Jessen, Commented Jul 28, 2023 at 9:13
please check my answer, I post modifyed code, but it doesnt work too — Ruslannnn
– Ruslannnn, Commented Jul 28, 2023 at 9:21
Please describe what happens - does it give you the wrong data in the csv? Does it fail with an error message? If so, what's the error message? I can't see your screen :) — Mathias R. Jessen
– Mathias R. Jessen, Commented Jul 28, 2023 at 9:23

Mathias R. Jessen · Accepted Answer · 2023-07-28 10:49:27Z

As mentioned in the comments, all you have to do is to not assign the desired value to a variable, and instead let PowerShell return it:

Foreach($PCName in $PCNameArray) {
    $arrayJobs += Invoke-Command -Credential $cred -scriptblock { 
                param (
                    [String]$ip                )
                $IPs = [System.Net.Dns]::GetHostAddresses("mail")
                $ips[0] # don't assign, just evaluate
    } -ComputerName $PCName -AsJob -ArgumentList $ip
}

Wait-Job $arrayJobs

$ResultArray=[System.Collections.ArrayList]@()

foreach ($job in $arrayJobs) {
    if ($job.State -eq 'Completed') {
        $ResultArray += Receive-Job $job
    } 
    Stop-Job $job
}

$ResultArray | Select PsComputerName,@{Name='IP';Expression='IPAddressToString'} | Export-Csv $OutputFile -NoTypeInformation -Delimiter ';' -Encoding UTF8

The IPAddressToString property on the resulting [ipaddress] objects will give you the string representation, eg. 10.0.0.1

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