Move-Item doesn't move file - powershell

Question

I've tried to rename a csv with powershell and then move it automatically to another folder, when there's no file.
Originally, the csv-name looks like this: import_9999_2020-08-13_132238.csv but the part with 9999 can also include just 2 or 3 digits.
My actual Code looks like:
#Import of path and target-path
$path = "\\network-path\subfolder\subfolder\subfolder\subfolder\subfolder1\"
$target_path = "\\network-path\subfolder\subfolder\subfolder\subfolder\subfolder2\"
#endless loop
$a=$true
while($a -eq $true){
$Files = gci $path
$TargetFiles = gci $target_path
#wait 5 minutes if path is empty
if(($Files).Count -eq 0){
sleep -Seconds 300
}
#if path is filled with one or more files
else {
#if file in target-path is processed (from another program)
if(($TargetFiles).count -eq 0){
#rename and move the latest file
get-childitem -path $path -Filter "import_*.csv"|
where-object { -not $_.PSIsContainer } |
sort-object -Property $_.CreationTime |
select-object -last 1 |
Rename-Item -NewName {($_.Name.Substring(0,($_.Name.Length)-22))+".csv"} |
Move-Item -Destination $target_path +"$($_.Name).csv"
}
sleep -Seconds 20
}
}
It works partly and renames the csv, but it doesn't move it to the target-path. The path is correct, i've copied it from the Windows-Explorer.
Any Ideas, why the program doesn't work completely? Thanks

Answer 1

For better readability, I would split the code where you find the original file, rename it and move it to the target path into several lines.
Also, Move-Item can rename the file aswell, so no need to do a Rename-Item first:
$file = Get-ChildItem -Path $path -Filter "import_*.csv" -File |
Sort-Object -Property $_.LastWriteTime |
Select-Object -Last 1
# create the new name for the file.
# or use regex: $newName = '{0}{1}' -f ($file.BaseName -replace '(_\d{4}-\d{2}-\d{2}_\d+)$'), $file.Extension
$newName = '{0}{1}' -f (($file.BaseName -split '_')[0..1] -join '_'), $file.Extension
# now move the file and rename at the same time
$file | Move-Item -Destination (Join-Path -path $target_path -ChildPath $newName)
I changed CreationTime to LastWriteTime to really get the latest file.
I also added the -File switch to the Get-ChildItem cmdlet, because only for old PowerShell versions you need to use where-object { -not $_.PSIsContainer }

Answer 2

If you want to pass it down the pipeline add -Passthru to the Rename-Item cmdlet
Somefile.txt | Rename-Item -NewName {$_.basename + "abc" + $_.ext} | # nothing in the pipeline
Somefile.txt | Rename-Item -NewName {$_.basename + "abc" + $_.ext} -Passthru | # now the new named fileinfo object is in the pipeline, contained in automatic variable $_