When you use a non-scalar (array or hash element) to hold a filehandle, you have to change your use of the diamond operator to readline: 

    readline( $nbdc_filehandles[$index] );
    readline( $nbdc_filehandles[$index] );

[download]

In some places, it's possible to disambiguate the use of a non-scalar filehandle using an anonymous block. For example, when using one as an indirect object for printing: 

print { $arrayOfFileHandles[ $n } } 'some data';

[download]
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In reply to Re: Using a filehandle tucked into an array by BrowserUk
in thread Using a filehandle tucked into an array by redbeard

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