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?

score 4 · Accepted Answer · answered Jun 17 '17 at 16:15

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 '17 at 16:15

mjolinor

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Thank you! That fixed the bug. Now, the bigger question... why doesn't it work? Always getting a 0 byte output file. – RockPaperLz- Mask it or Casket Jun 17 '17 at 16:20
I'd check $Diff and make sure you're actually getting LH side differences from your Compare-Object. – mjolinor Jun 17 '17 at 16:26
Do you have time to discuss this in chat? – RockPaperLz- Mask it or Casket Jun 17 '17 at 16:31
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. – mjolinor Jun 17 '17 at 16:38
Thank you. Toss one on the grill for me too! :) – RockPaperLz- Mask it or Casket Jun 17 '17 at 16:42

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

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