PowerShell check files: foreach loop on failure - powershell

Question

I am using PowerShell copy files to multiple locations, then do a check after copy done, I want to send a message on failure if one or more files does not exist on one of the destinations.
$SRCDIR1 = "C:\temp\Copy\00_S"
$DST = "C:\temp\Copy\01_D","C:\temp\Copy\02_D","C:\temp\Copy\03_D"
$File_list = Get-ChildItem -Path $SRCDIR1\*.xml
$DST | %{ Copy-Item $SRCDIR1\*.xml -Destination $_ }
Foreach ($item in $File_list) {
If (Test-Path $DST ) {
Write-Host $item exists in $DST
}
else {
Write-Host $item DOES NOT exists in $DST
}
}
It works when all files are in all destinations, but if I delete different files from different destinations testing "write-host if not exist", it still "write-host" everything exists.
On failure, i want it "write-host" which file doest not exist on which destination separately. How can I modify the code?
Update made it working. has to be loop in loop....
$FileList = Get-ChildItem -Path $SRCDIR1\*.xml | Select -ExpandProperty Name
Foreach ($item in $FileList){
$DST |
% {if (Test-Path ($_ + "\" + "$item")){
write-host $item exist in $_ -ForegroundColor Green
}else{
write-host $item does not exist in $_ -ForegroundColor Red
}
}
}

Answer 1

Your $DST is an Array of Strings and this is the "problem", as Test-Path will return one boolean value for each path in that array:
PS> $DST = "C:\temp\Copy\01_D","C:\temp\Copy\02_D","C:\temp\Copy\03_D"
PS> Test-Path $DST
True
True
False
Which means if(Test-Path $DST) will be the same as if(#($true, $true, $false)). Let's see how they are evaluated:
PS> if ($false) {"HA!"} else {"Ney"}
Ney
PS> if (#($false, $false)) {"HA!"} else {"Ney"}
HA!
As you can see, if ($variable) evaluates to $true, when $variable is any non-null value which is not $false, so even #($false, $false, $false) will evaluate to $true.
Don't check $DST, instead check for $item's existence:
if (Test-Path $item) {
Write-Host $item exists in $DST
}