powershellfile-renamesequential-number

How can I rename files by prepending a sequence number to the original file names?

guys does anyone know how can i do this? I am trying to list some files in a numerical order by adding 1, 2, 3 and so on to the beginning of the file names while also keeping the files' original names.

Here are the codes i tried

$nr = 1

Dir -path C:\x\y\deneme | %{Rename-Item $_ -NewName (‘{0} $_.Name.txt’ -f $nr++ )}

dir | select name

This code just orders the files like 1, 2, 3... Without keeping the original names.

$n = 1
Get-ChildItem *.txt | Rename-Item -NewName { $_.Name -replace $_.Name ,'{0} $_.Name' -f $n++}

This one did not work like i thought.

Solution

  • Try the following, which renames all .txt files in the current dir. by prepending a sequence number to them:

    $n = 1
Get-ChildItem *.txt | 
  Rename-Item -WhatIf -NewName { '{0} {1}' -f ([ref] $n).Value++, $_.Name }

    Note: The -WhatIf common parameter in the command above previews the operation. Remove -WhatIf once you're sure the operation will do what you want.

    The ([ref] $n).Value++ trick makes up for the fact that delay-bind script blocks run in a child scope of the caller, where the caller's variables are seen, but applying ++ (or assigning a value) creates a transient, local copy of the variable (see this answer for an overview of PowerShell's scoping rules).
    [ref] $n in effect returns a reference to the caller's variable object, whose .Value property can then be updated.

    As for what you tried: