How to replace first letters of a file name using Power shell or CMD

Question

Hi guys i am having a problem on mane files that i have which are duplicated. The main reason i cant group them by name is because they have numbers in front of their name which differs Eg
01 - fileName.txt
09 - fileName.txt
02 - fileName.txt
11 - fileName.txt
i have a shed loads of them and would like to rename them by deleting the first three characters if they are numbers. I managed to create a powershell script to do that but the problem was that it would not work properly because the file would have a duplicated
name after deleting the first few chars.
can anyone help with a better script which would add a number to the end of the file name eg:
fileName1.txt
fileName2.txt
fileName3.txt
Ps all the files start with two numbers followed by a dash, however i have manually done a few which does not start with numbers and should be left alone by the script
Thank you

Answer 1

Here's a quick way to do it. I'm not sure what your existing code looks like but it sounds like you could incorporate this line into it.
if ($oldfilename -match "[0-9]")
$newfilename = $oldfilename.split("-")[1].trim().split(".")[0] + $oldfilename.split("-")[0].trim() + "." + $oldfilename.split("-")[1].trim().split(".")[1]
else
$newfilename = $oldfilename
01 - fileName.txt becomes fileName01.txt
fileName.txt stays fileName.txt