open OUT, $out || die "Can't open $out!\n";

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Using the high precedence || operator means that the dies are superfluous. You should use the low precedence or operator instead. .

Or, use parentheses if one wants to use '||' ... 

open( OUT, $out ) || die "Can't open $out: $!\n";

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In reply to Re^2: Spliting an mbox file by parv
in thread Spliting an mbox file by monger

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