Powershell 'cannot bind argument to parameter' error when using answer

Question

The most popular answer for this question involves the following Windows powershell code:

$file1 = Get-Content C:\temp\file1.txt  
$file2 = Get-Content C:\temp\file2.txt   
$Diff = Compare-Object $File1 $File2  
$LeftSide = ($Diff | Where-Object $_.SideIndicator -eq '<=').InputObject  
$LeftSide | Set-Content C:\temp\file3.txt

Yet when I try to use that code, I get the following error:

Where-Object : Cannot bind argument to parameter 'FilterScript' because it is null.

Why am I getting this error, and how do I resolve it?

mjolinor · Accepted Answer · 2017-06-17 16:15:12Z

4

Looks like a simple syntax error. Where-Object requires the conditional filter to be presented as a scriptblock (hence "FilterScript"):

Where-Object {$_.SideIndicator -eq '<='}

answered Jun 17, 2017 at 16:15

mjolinor

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5 Comments

Amazon Dies In Darkness Over a year ago

Thank you! That fixed the bug. Now, the bigger question... why doesn't it work? Always getting a 0 byte output file.

mjolinor Over a year ago

I'd check $Diff and make sure you're actually getting LH side differences from your Compare-Object.

Amazon Dies In Darkness Over a year ago

Do you have time to discuss this in chat?

mjolinor Over a year ago

Not right now (I have burgers on the grill), but if you're having problems with the Compare-Object results, just post another question and somebody will probably chime in.

Amazon Dies In Darkness Over a year ago

Thank you. Toss one on the grill for me too! :)

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