rename all files within a directory and its subdirectories with batch script

Question

I would like to rename the name and the extension of all files which are located in the a certain directories and its subdirectories to a random combination of 25 alphamuneric signs (letters and figures) which is equal to the filename. The fileextension should be ".TEST"

I have found the following script which only renames in a parent directory and the it only changes the name to a random integer.

@ echo off
setlocal EnableDelayedExpansion
for %%F in ("%userprofile%\music\*.*") do (
    ren "%%~F" "!RANDOM!.test"
)
endlocal

So how to do it with all child directories and the combination of letters and numbers?

Answer 1

put /R after the word for so it recurses into subdirectories

@ echo off
setlocal EnableDelayedExpansion
for /R "%userprofile%\music\" %%F in (*.*) do (
    ren "%%~fF" "%%~fF%RANDOM%.test"
)
endlocal

see more details on the recursive for loop here: https://ss64.com/nt/for_r.html

for Random number generation, enclose the RANDOM in % signs like %RANDOM%. https://riptutorial.com/batch-file/example/32511/random-numbers

if you want to put a dot between the original file name and the new extension, try ren "%%~fF" "%%~F.%RANDOM%.test". on my system it formats names like Textures\Interface\VUI+\solid_black.dds.230.test

for powershell I'd do something like (this is a dryrun; remove -WhatIf from the line when you are satisfied it works and want to actually execute the rename)

Get-ChildItem $env:USERPROFILE\music\ -Recurse -File | Rename-Item -WhatIf -NewName { $_.Name + "." + (Get-Random -Maximum 1000)+ ".test"}