How does one rename all folders and files in a folder into UPPERCASE? (if it is possible in its subfolders too)

I have this code, but it converts only files, not folders.

@echo off
setlocal enableDelayedExpansion

pushd %currentfolder%

for %%f in (*) do (
   set "filename=%%~f"

   for %%A in (A B C D E F G H I J K L M N O P Q R S T U V W X Y Z) do (
      set "filename=!filename:%%A=%%A!"
   ren "%%f" "!filename!" >nul 2>&1
  • 1
    Does it have to be done via batch? Not that it can't, but there are just so many easier ways via third-party utils. – Karan May 23 '15 at 0:31

Non-recursive solution.

I don't know cmd.exe, so I can't fix your script, but if you have Python installed, you can use this script (which should work on all OSes):

import os

files = os.listdir('.')
for f in files:
    newname = f.upper()
    if newname == f:
    if newname in files:
        print( "error: %s already exists" % newname )
    os.rename(f, newname)

Just save it as upcase_files_folders.py and then run python upcase_files_folders.py in the directory whose files you wants to rename.

Update: Recursive solution.

Sorry, I just realized you wanted a recursive solution.

The following script will walk the subdirectory tree, recording the files and subdirectories to be renamed on a stack. Then it pops the files/subdirectories from the stack one by one and upcases them.

(A two-stage solution is best, to avoid renaming directories in the middle of the traversal. Trying to do it all at once is going to be error-prone and fragile.)

Also, it's probably best to keep a log of the changes in case you run the script in error. This script will record all renames in .upcase_files_folders.log.

from __future__ import print_function
import os

with open('.upcase_files_folders.log','a') as logfile:
    renames = []
    for d, subdirs, fs in os.walk(os.getcwd()):
        for x in fs + subdirs:
            oldname = os.path.join(d, x)
            newname = os.path.join(d, x.upper())
            if x == '.upcase_files_folders.log' or newname == oldname:
    for (oldname, newname) in reversed(renames):
        os.rename(oldname, newname)
        print( "renamed:  %s  -->  %s" % (repr(oldname), repr(newname)), file = logfile )

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