Question

In a Windows command prompt, how can I rename all the files to lower case and remove all spaces?

Answer 1

Make a batch file

@echo off
setlocal enabledelayedexpansion
for /f "delims=" %%i in ( ' dir /b /a-d *.* ') do (
set name="%%i"
set newname=!name: =!
rename "%%i" !newname!
)

NOTE: Run under a test directory and see if you have the expected result. I have not tested it.

EDIT: Forgot to say this will only remove the spaces.