How do I increment a folder name using Windows batch?

Question

I\'ve got a batch script that creates a folder named New_Folder and a few subdirectories and files within. Currently, if I need to create multiple New_Folders I have to rena

Answer 1

This solution find the largest numbered name, and create the next one to it:

@echo off
for /d %%d in (New_Folder*) do set lastFolder=%%d
set /A nextFolder=%lastFolder:*New_Folder=% + 1
mkdir New_Folder%nextFolder%

EDIT: Previous solution doesn't correctly get the last numbered folder, but the next one is correct:

@echo off
setlocal EnableDelayedExpansion
set lastFolder=0
for /d %%d in (New_Folder*) do (
   set folder=%%d
   set folder=!folder:New_Folder=!
   if not defined folder set folder=0
   if !folder! gtr !lastFolder! set lastFolder=!folder!
)
set /A nextFolder=lastFolder+1
mkdir New_folder%nextFolder%