I've tried to write a batchfile, which would check it's own directory for other batch files and check these for a certain text. If the text is found, I want the program to jump to the end, otherwise copy itself into the found file. Here's how I tried:
rem windowsisajoke
for %%f in (*.bat) do (set A=%%f)
set FILE=%A%
set CONTENT=windowsisajoke
findstr /i "%CONTENT%" %FILE% >NUL
if errorlevel 0 goto end
copy %0 %A%
:end
if errorlevel 0
actually means "if errorlevel is zero or greater". (I know - very intuitive...)
Either change your logic:
if errorlevel 1 copy %0 %A%
or use
if %errorlevel%==0 goto :end