So basically I have this batch file:
@echo off bps -f bps.txt exit
Everytime I run the batch the new bps.txt file overwrites the old one. What I want is to somehow everytime I run it the new file must come out as e.g. bps1.txt . If I run it again it should come out as bps2.txt and so on. So for example if I run the batch 3 times, I would have bps.txt, bps1.txt, bps2.txt .
there is no build-in-function for this. Use a counter, check if the file exists, if not increment the counter and try again:
set "counter=" :SearchFreeFile if exist bps%counter%.txt ( set /a counter+=1 goto :SearchFreeFile ) bps -f bps%counter%.txt 
Looping is time consuming. If you expect that the filenames are created consecutively you can do it like this:
for /f %%a in ('dir /b bps*.txt^|find /c /v ""') do set /a next=%%a bps -f bps%next%.txt The for command here is NOT used to loop - it merely saves the output of the command in apostrophes in the %%a variable. With dir we list the existing files with that name pattern, the find command counts them. So if you already have 2 files of that name the output will be "2".
Different to your example the very first file will be named "bps0.txt", not "bps.txt". If you want to avoid this, use this instead:
for /f %%a in ('dir /b bps*.txt^|find /c /v ""') do set /a next=%%a if %next% EQU 0 (set bps=bps) else (set bps=bps%next%) bps -f %bps%.txt 
dir /od (newest file should be the one with the highest number, but this isn't true anymore, when files were edited in the meantime.)You could do this:
@echo off if not exist "bps.txt" ( bps -f bps.txt exit ) for /l %%i in (1,1,10000) do ( set "number=%%i" if not exist "bps%%i.txt" goto :break ) echo 10000 files with this name already exist pause exit :break bps -f bps%number%.txt pause exit My previous answer takes the first "free" counter - if you delete some of the "old" files, it would fill the gaps with new files.
Another way (a bit unusual, but effective): use alternative datastream to "save" the counter. Adds +1 for every instance, independent of possible deletion of some (or all) previous files (at least until you reach the limits of Integer).
<%~f0:count set /p count= set /a count+=1 (echo %count%)>%~f0:count bps -f bps%count%.txt You can "reset" the counter with (echo 0)>mybatch.bat:count
(note: no check, if the file exists)
