PowerShell. Copy 2 files to all subfolders of a tree : why is the command doing nothing?

Try this...

$source="C:\temp\temp"
$destinationRoot="C:\Users\sunil\Documents\test"
$itemstoCopy=Get-ChildItem $source
foreach ($file in $itemstoCopy) {

$allfolders=Get-ChildItem $destinationRoot
foreach ($folder in $AllFolders) {
Write-host "Item to Copy:"  $file.FullName   "Copying to:" $Folder.FullName
Copy-Item $file.FullName -Destination $folder.FullName
    }
}

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Maybe because is missing the -Recurse switch, and because fullname give you the full Path and Name and you're not even trying to write into "C:\documents".
Wrong code:

Get-ChildItem -Path c:\template -recursive | ?{ $_.PSIsContainer } | Copy-Item c:\documents $_.fullname

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Corrected code: (will post it shortly it has issues the one I've commented previously)
Function CopyInfo, CopyInfo -sourceDir $Source -targetDir $FolderName  (just define $sourcedir and $targetDir variables.

function CopyInfo{
    [CmdletBinding()]
    param(
        [Parameter(Position=0,mandatory=$true)] [string]$sourceDir,
        [Parameter(Position=1,mandatory=$true)] [string]$targetDir
    )

    if(! [System.IO.Directory]::Exists($targetDir) ){
        #create new directory
        [System.IO.Directory]::CreateDirectory($targetDir) | Out-Null
    }

    #get source files
    foreach($file in [System.IO.Directory]::GetFiles($sourceDir) ){
            $FilePath=[System.IO.Path]::Combine($targetDir, [System.IO.Path]::GetFileName($file))
            if(![System.IO.File]::Exists($FilePath) ){
                #Write-Output "Writing $file"
                [System.IO.File]::Copy($file, $FilePath)
            }
            else{
				$FileInfoExisting = new-object System.IO.FileInfo($FilePath)
				$FileInfoNew      = new-object System.IO.FileInfo($file)
				
				#3 items check
				#1 check creationtime (preserve the newest)
				#2 lastwriteTime (preserve newest)
				#3 Length
				
                #Write-Output "Overwriting $file"
                [System.IO.File]::Delete($FilePath)
                [System.IO.File]::Copy($file, $FilePath)
            }
    }

    foreach($dir in [System.IO.Directory]::GetDirectories($sourceDir) ){
    $test = [System.IO.Path]::Combine($targetDir, (New-Object -TypeName System.IO.DirectoryInfo -ArgumentList $dir).Name)
        CopyInfo -sourceDir $dir -targetDir $test
    }
 }

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If you only wanted to copy into a single folder

Get-ChildItem -c:\template\* -File | Copy-Item -destination c:\documents 

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would be correct.
Since you want to copy into multipe folders, you'll  need to do it different. If you do not want to be selective, just copy into all first-level subfolders of C:\Documents, which I assume:

foreach ($folder in Get-ChildItem c:\Template -Directory)
{
  Get-ChildItem C:\Template\* -File | Copy-Item -Destination $folder
}

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Instead of that, you can enumerate manually in the foreach.

Amazing !!!

Glad to help. :)

I see my second suggestion has a typo, and should be

foreach ($folder in Get-ChildItem c:\Documents -Directory)
{
  Get-ChildItem C:\Template\* -File | Copy-Item -Destination $folder
}

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This and Jeremy's code are valid, and which one to use is a matter of preference only.