How to pass a param to script block when using invoke-command

Question

_{Tuesday, May 4, 2010 9:29 AM}

Example:

invoke -computername $temp -scriptBlock {How to pass the $temp value in here}

All replies (6)

_{Tuesday, May 4, 2010 11:41 AM ✅Answered | 5 votes}

You need to use ArgumentList parameter  to include the values of local variables in a command run on a remote computer.

Invoke-Command -ComputerName $Computer -ScriptBlock {param($comp) write-host "This script is running on machine: $Comp" } -ArgumentList $Computer

Aleksandar Nikolić http://powershellers.blogspot.com http://twitter.com/alexandair

_{Wednesday, May 5, 2010 12:59 AM ✅Answered | 4 votes}

I use $ExecutionContext.InvokeCommand.NewScriptBlock() to do what you are trying to do:

$scriptblock = $ExecutionContext.InvokeCommand.NewScriptBlock("write-host "This script is runnong on machine: $Computer")

Invoke-Command -ComputerName $Computer -ScriptBlock $scriptblock

I put together a blog post that discusses dynamic code in scriptblocks.  I do, however, like Aleksandar's suggestion to use -ArgumentList parameter.  It's useful for quick problems like yours, but if you are doing a rather large dynamic scriptblock it is not as effective as using NewScriptBlock().

http://powertoe.wordpress.com/2010/02/10/dynamic-code-in-powershell/

_{Wednesday, May 5, 2010 9:56 AM ✅Answered}

Nice. I've learnt something new.

One thing to be careful about - outer quotes should be a double, and inner quotes a single ones.

PS[39]>$scriptblock = $ExecutionContext.InvokeCommand.NewScriptBlock("write-host 'This script is running on machine: $Computer'")

Aleksandar Nikolić http://powershellers.blogspot.com http://twitter.com/alexandair

_{Tuesday, May 4, 2010 10:44 AM}

When Running the Invoke-Command Cmdlet, you should run it as the following

Invoke-Command -ComputerName $ComputresArray -ScriptBlock { Same command as you type it on your local computer }

what is the script you'r trying to run?

_{Tuesday, May 4, 2010 11:01 AM}

like, if I run the following command,

Invoke-Command -ComputerName $Computer -ScriptBlock { write-host "This script is running on machine: $Computer" }

I know that in the script block, the value of $Computer is null, rather than the expected value which should be the remote computer name.

_{Thursday, May 6, 2010 3:05 PM | 2 votes}

Maybe a question for a new thread, but will

$scriptblock = $ExecutionContext.InvokeCommand.NewScriptBlock("write-host "This script is runnong on machine: $Computer")

be the same as:

$scriptblock = [scriptblock]::create("write-host "This script is runnong on machine: $Computer")

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