/me thinks
You may want an END block along these general lines.

END { system('\bin\mv',TEMPFILENAME,FILENAME) }

I'm not sure what type on interruption you are talking about or which ones will run the END block, but it may solve the problem.

In reply to Re: Temporary files and cleaning up after an interruption by repson
in thread Temporary files and cleaning up after an interruption by mischief

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