Detecting if a file is open in a batch file

Question

Say I have a batch file for carrying out a long build and at the end it creates an EXE. If I forget to close the app down before I start the build, the link phase fails whe

Answer 1

Found a better way:

:start
timeout /T 5

if exist %1 (
2>nul (
  >> %1  (call )
) && (goto ende) || (goto start) ) else ( exit )


:ende
YourCode

This will check every after 5 seconds for "is the file in use" if it its it will start again. if not it turns to ende where you can do your next options