Replace old file with new file

Question

I am trying to write a script to replace old files content with new files content which is appearing in the following format:

Old file : something.txt
New file : s

Answer 1

@echo off
setlocal
set FOLDER_PATH=D:\test
for %%f in (%FOLDER_PATH%\*.new) do if "%%~ff" neq "%~f0" (
    ECHO move /Y "%%~ff" "%%~dpnf"
)
PAUSE

or

@echo off
setlocal
set FOLDER_PATH=D:\test
for %%f in (%FOLDER_PATH%\*.new) do if "%%~ff" neq "%~f0" (
    if exist "%%~dpnf" ECHO del "%%~dpnf"
    ECHO rename "%%~ff" "%%~nf"
)
PAUSE

Note that operational move (del and rename) commands are merely ECHOed for debugging purposes.

Also note that if "%%~ff" neq "%~f0" could be omitted iterating *.new files as %~f0 has an extension of .bat or .cmd (try echo %~x0 %~f0).

Resources (required reading):

• (command reference) An A-Z Index of the Windows CMD command line
• (additional particularities) Windows CMD Shell Command Line Syntax
• (%~ff etc. special page) Command Line arguments (Parameters)
• (>, 2>&1 etc. special page) Redirection