Rename from CSV Script renames files but trys to repeat process

I have a script which renames files taken from a CSV but it throws an error when it trys to re-rename files after it has already carried out the successful proceedure

CSV file is like:

old      new
AC100    DC100
AC101    DC102

Code tried:

$sourceDir = read-host "Please enter source Dir:"
$csvL = $sourceDir + "\files.csv"
$csv = import-csv $csvL
$files = get-childitem $sourceDir
$csv | % {
            ForEach( $file in $files){
            if($file = $_.old){

            $old = $sourceDir + "\" + $_.old

            Rename-Item $old $_.new
                    }       
                }
            }

I beleive it is something to do with looping and the csv but im not sure where im going wrong, i have had similar issue before.

Here is a sample of the error.

+             Rename-Item  <<<< $old $_.new
Rename-Item : Cannot rename because item at 'C:\scripts\2039X.67438.TXT' does not exist.
At C:\scripts\renamerTim.ps1:18 char:15
+             Rename-Item  <<<< $old $_.new
Rename-Item : Cannot rename because item at 'C:\scripts\2039X.67438.TXT' does not exist.
At C:\scripts\renamerTim.ps1:18 char:15
+             Rename-Item  <<<< $old $_.new
Rename-Item : Cannot rename because item at 'C:\scripts\2039X.67438.TXT' does not exist.
At C:\scripts\renamerTim.ps1:18 char:15
+             Rename-Item  <<<< $old $_.new
Rename-Item : Cannot rename because item at 'C:\scripts\2039X.67438.TXT' does not exist.
At C:\scripts\renamerTim.ps1:18 char:15
+             Rename-Item  <<<< $old $_.new
Rename-Item : Cannot rename because item at 'C:\scripts\2039X.67438.TXT' does not exist.
At C:\scripts\renamerTim.ps1:18 char:15
+             Rename-Item  <<<< $old $_.new
Rename-Item : Cannot rename because item at 'C:\scripts\2039X.67438.TXT' does not exist.
At C:\scripts\renamerTim.ps1:18 char:15
+             Rename-Item  <<<< $old $_.new
Rename-Item : Cannot rename because item at 'C:\scripts\2039X.67438.TXT' does not exist.
At C:\scripts\renamerTim.ps1:18 char:15
+   开发者_如何学运维          Rename-Item  <<<< $old $_.new

thanks in advance, Craig

I think the ForEach( $file in $files) is redundant, since you already traverse each "file" with the $csv | % { command. I'd try something like:

$csv | Foreach-Object { //I prefer to print the full commands in scripts
    $oldfile = $sourcedir + "\" + $_.old
    if (Test-Path $oldfile)
    {
        Rename-Item $oldfile ($sourcedir + "\" + $_.new)
    }
}

You have a redundant nested loop. $csv | %{ ... } will already loop through file in the csv, and then the foreach loops through each file in the folder.

Try this:

  $sourceDir = read-host "Please enter source Dir:"
  $csvL = $sourceDir + "\files.csv"
  $csv = import-csv $csvL
  $files = get-childitem $sourceDir
  $csv | % {
     $oldpath = join-path $sourcedir $_.old
     $newpath = join-path $sourcedir $_.new

     rename-item $oldpath $newpath
  }