Calling this powershell command and getting an error. Driving me nuts.
Prompt> get-childitem -recurse ./ *NYCSCA* | where-object { $_.Name -like
"*NYCSCA*" } | rename-item $_ -newname $_.Name.Replace(" ","_") -whatif
Here is the response:
You cannot call a method on a null-valued expression.
At line:1 char:140
+ get-childitem -recurse ./ *NYCSCA* | where-object { $_.Name -like "*NYCSCA*" } | select FullName | rename-item $_ -n
ewname $_.Name.Replace <<<< (" ","_") -whatif
+ CategoryInfo : InvalidOperation: (Replace:String) [], RuntimeException
+ FullyQualifiedErrorId : InvokeMethodOnNull
If I remove the last part, I get a list of files. Any clues? I have not grocked powershell yet, obviously.
Note: I tried to post this to superuser, but the site is consistently failing now - won't let me add this exact question.
Here it is greatly simplified. I cannot even get this classic example to work.
gci *NYCSCA* | ren $_ ($_.Name).Replace("foo","bar")
Thank you @JNK, the % did it. The solution I needed is this, in case you're interested:
gci -recurse | where-object{ $_.Name -like "*NYCSCA*"} | %{rename-item $_.FullName $_.FullName.Replace("NYCSCA","SDUSD") }
I think you need foreach-object:
get-childitem -recurse ./ *NYCSCA* | where-object { $_.Name -like
"*NYCSCA*" } | % {rename-item $_ -newname $_.Name.Replace(" ","_") -whatif}
The piped array can't be renamed as a set.
Here's a simplified version to rename files only
Get-ChildItem -Filter *NYCSCA* -Recurse |
Where-Object {!$_.PSIsContainer} |
Rename-Item -NewName { $_.Name.Replace(' ','_') } -WhatIf
(Edit: line breaks added for clarity)
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