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I cannot see anything obvious that might cause your output file to be empty -- other than perhaps there were no events that matched your criteria. Is that possible?
This is the error i am getting since the file app_output.txt is empty couldn't read C:\log_parsing\app_output.txt - at log_windows_new.pl line 444.
That still doesn't isn't the full error message.
Line 444 is:
The $! should mean that the full error message would be something like:
Or perhaps:code> couldn't read C:\log_parsing\app_output.txt - Permission denied at log_windows_new.pl line 444. #.............................................^^^^^^^^^^^^^^^^^ </code>
That piece of information would likely point to the source of the problem; but you haven't given us it?
I'd also suggest that you add $^E to line 44 (and other error messages). Ie:
That may provide further clarification of the problem.
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In reply to Re^3: Creating thread to call Subroutines parallely