Take it piecewise. The part inside the brackets is $file or die "...". That will die if $file is zero or an empty string, or otherwise false.

Then the result gets given to the open function. open "filename"; doesn't make any sense.

See open, and use something more like open my $inputFileHandle, '<', $filename or die "can't open $filename for reading: $!\n";

In reply to Re^9: Use of uninitialized value in string eq by SuicideJunkie
in thread Use of uninitialized value in string eq by Anonymous Monk

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