Passing Parameters to Remote PowerShell Session Inside a Script

Let’s take a look at the following script named md.ps1:

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param( [System.String] $ComputerName, [System.String] $Configuration, [System.String] $BuildDefinition ) $session = New-PSSession -ComputerName $ComputerName Invoke-Command -Session $session -ScriptBlock { $latestbuildfolder = Get-ChildItem "C:\procmon\procmonBuilds\$BuildDefinition" | Sort-Object LastWriteTime -Descending | SELECT-Object -First 1 $deploycmdlocation = "\procmon\procmonWebProject\$Configuration\_PublishedWebsites\procmonWebProject_Package\procmonWebProject.zip" $finalstring = $latestbuildfolder.FullName + $deploycmdlocation $finalstring } Remove-PSSession $session

When I run using below syntax it will not work as expected on a remote computer.

PS> .\md.ps1 “computer1” “Release” “ReleaseBuildConfig”

It will replace $BuildDefinition variable but then it will not list all its child folders.  Further more it will not replace $configuration variable with the value, for example, “Release” or “Debug”.   As soon as I hard coded them the rest of the command worked just fine.  Ok so what was the issue.

It turns out that when you are trying to pass parameters to a script and then invoke a remote powershell session and access variables inside that PSsession then you have to declare them twice in your scripts. Yes Twice.  Check the final script.

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param( [System.String] $ComputerName, [System.String] $Config, [System.String] $BuildDef ) $session = New-PSSession -ComputerName $ComputerName Invoke-Command -Session $session -ScriptBlock { param( [string] $ComputerName, [string] $Configuration, [string] $BuildDefinition) $latestbuildfolder = Get-ChildItem "C:\procmon\procmonBuilds\$BuildDefinition" | Sort-Object LastWriteTime -Descending | SELECT-Object -First 1 $deploycmdlocation = "\procmon\procmonWebProject\$Configuration\_PublishedWebsites\procmonWebProject_Package\procmonWebProject.zip" $finalstring = $latestbuildfolder.FullName + $deploycmdlocation $finalstring } -args $ComputerName, $Config, $BuildDef Remove-PSSession $session

It was painful to figure it out and my co-worker friend helped me figure it out.