Hi,
in the folowing batch, I would compare if the file is the same in the source DIRECTORY and in the destination directory.

with the commande : copy c:\TEMP\*.pdf c:\psipi\rde\30

Note that *.pdf is not ever the same. So I would know that if the 2 *.pdf files are same, the loop make a rename with an extension *_1 or *_2.pdf
Thanks a lot for the help

MY BATCH :

@ECHO OFF
CLS

SET RSOURCE=%1
ECHO REPERTOIRE SOURCE=%RSOURCE%

SET FICHIER=%2
ECHO FICHEIR=%FICHIER%

SET RDESTINATION=%3
ECHO REPERTOIRE DESTINATION=%RDESTINATION%

FOR /F "tokens=1,2* delims=." %%G IN ("%FICHIER%") DO CALL :SPLIT %%H %%G
GOTO :SKIP

REM **************************************************************
:SPLIT
SET EXTENSION=%1
ECHO EXTENSION=%EXTENSION%
SET RACINE=%2
ECHO RACINE=%RACINE%
REM **************************************************************
GOTO :EOF
:SKIP

SET SOURCE=%FICHIER%
ECHO SOURCE=%SOURCE%

SET BACKUP=%RACINE%.%EXTENSION%
ECHO BACKUP=%BACKUP%

CD %RDESTINATION%
IF NOT EXIST %BACKUP% GOTO :FIN

SET INDEX=0
REM ***********************************************************
:LOOP
SET /A INDEX+=1
SET BACKUP=%RACINE%_%INDEX%.%EXTENSION%
ECHO %BACKUP%
IF EXIST %BACKUP% GOTO :LOOP

REM **********************************************************
:FIN
ECHO %BACKUP%



REM #################################################################################################
ECHO FICHIER=%FICHIER%
ECHO SOURCE=%SOURCE%
ECHO BACKUP=%BACKUP%

IF NOT %FICHIER%==%BACKUP% RENAME %FICHIER% %BACKUP%
COPY %RSOURCE%\%SOURCE% %FICHIER%
REM #################################################################################################
cd..
GOTO :EOF

REM **********************************************************
:EOF