PowerShell error in renaming of subfolders - powershell

Question

I am a PowerShell newbie. I have the following command to rename all subfolders:
Get-ChildItem -r | foreach{Rename-Item $_.FullName ($_.Name -replace "2021", "2021 renamed")}
This command works correctly, but also returns an error message:
Rename-Item : Source and destination path must be different.
At line:1 char:28
+ ... e | foreach{Rename-Item $_.FullName ($_.Name -replace "2021", "2021 r ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : WriteError: (C:\Users\abc\...def\ghi\2025:String) [Rename-Item], IOException
+ FullyQualifiedErrorId : RenameItemIOError,Microsoft.PowerShell.Commands.RenameItemCommand
Where ...def\ghi\2025 is the last subfolder.
Could someone please advise me what the error in my command is?

Answer 1

If you want to only rename subfolders, then you should add -Directory parameter. Also, you can pipe directly to Rename-Item, no foreach loop is required. The error message is shown for those items that you don't actually change (don't have 2021 in the name for example so the new name is the same as the old.) You could just set erroraction to silently continue.
Get-ChildItem -Directory -Recurse |
Rename-Item -NewName {$_.Name -replace "2021", "2021 renamed"} -ErrorAction SilentlyContinue
Or if you'd prefer you can stick with the loop and only attempt to rename those that actually have the matching criteria
Get-ChildItem -r | ForEach-Object{
if($_.name -match '2021')
{
Rename-Item $_.FullName ($_.Name -replace "2021", "2021 renamed")
}
}