Hi, I'm trying to workout how to code a batch file which can sit in a folder and when run, scan every text file in the same folder and remove duplicate lines of text. I've seen several versions on computing.net but unfortunately none work in my instance, as I would like to run it against all files in the same directory, not just a single file. I found this posted on computing.net already but can't work it... I also want to be able to just update the existing file, not output to a new file - if at all possible; ===== BATCH SCRIPT BEGIN ===== :: Leonardo Pignataro (secret_doom@hotmail.com) @echo off if not "%1"=="" goto chkext echo Missing parameter echo Sintax: %0 filename goto eof :chkext if exist %1 goto start echo File not found - %1 goto eof :start type nul> %TEMP%.\TEMP.DAT FOR /F "delims=" %%a in (%1) do ( FIND "%%a" < %TEMP%.\TEMP.DAT > nul if errorlevel=1 echo %%a>> %TEMP%.\TEMP.DAT ) copy/y %TEMP%.\TEMP.DAT %1 > nul if exist %TEMP%.\TEMP.DAT del %TEMP%.\TEMP.DAT :eof ===== BATCH SCRIPT END ===== Can anyone help? I'm not a good coder and I've searched high and low for a script already available but to no avail. Regards Alex

I am honoured to modify secret_doom's script, the ultimate Master of batch scripting, who guided me to that art. :: NODUP.BAT Usage: nodup @echo off echo. echo. Processing .txt files in "%CD%" echo. Please wait... for %%j in (*.txt) do ( type nul > %TEMP%.\TEMP.DAT for /F "delims=" %%a in ('type "%%j"') do ( find "%%a" < %TEMP%.\TEMP.DAT > nul if ErrorLevel 1 echo %%a>> %TEMP%.\TEMP.DAT ) copy %TEMP%.\TEMP.DAT "%%j" > nul if exist %TEMP%.\TEMP.DAT del %TEMP%.\TEMP.DAT ) echo. DONE! :: End_Of_Batch

Wow, thats a great response and the batch as you already knows works flawlessly. I must learn to batch code myself. Excellent job IVO I really appreciate it.