So, in general I would open the output file before I had calculated some result to output to it.

For me it's a dilemma. Either: the case you described or ending up with an empty file created on disk after each error in between, which I then try to delete after each of the numerous error/abort conditions. Not an ideal world. Of course there's Perl's END{} but not all languages provide this.

In reply to Re^4: Filehandle in subroutine in use VRML.pm by bliako
in thread Filehandle in subroutine in use VRML.pm by smittypaddler

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