Hello All, I am creating a simple batch file to copy files, log the timestamp and log the copy result. However, I got error when using a program to call this batch file concurrently, it flow an error that "The process cannot access the file because it is being used by another process." It seems that the ECHO having problem when doing concurrent job. I wondering if there is any command in DOS to do the TRY and CATCH action, or WAIT command to access the file when it is available? THANKS. MY CODE AS BELOW: :: BACKUP FILE @ECHO OFF ECHO %timestamp% START BACKUP BATCH >> bat.log SET timestamp=%date:~4,6%%date:~12,2% %time:~0,8% :SRCFILE If not exist %1 goto :SRCNO :BACKUP copy /y %1 %2 SET msg1= ---Backup File %1 success--- GOTO return%errorlevel% :SRCNO SET msg1= ---BACKUP FAILURE: Source File %1 not found--- ECHO %timestamp% %msg1% (error) >> bat.log EXIT :return0 ECHO %timestamp% COPY SUCCESS >> bat.log GOTO end :return1 ECHO %timestamp% COPY FAILED >> bat.log GOTO end :end ECHO End of batch program

Try-catch? No. The closest you could do is: :loop1 ECHO %timestamp% START BACKUP BATCH >> bat.log || GOTO loop1

I have just run into the same problem under a little different circumstances. The file I am logging to gets locked for no apparent reason. I will let you know if I find anything out.