The problem is based around the fact that the < > structure is used for globbing as well as reading. Therefore anything other than a simple variable or bareword, confuses perl. The solution (from memory) is to enclose the contents in braces or (slightly clearer) use the underlying function readline. 
# $line = <$file_h{$temp1}>;
$line = < {$file_h{$temp1}} >;
$line = readline($file_h{$temp1});

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In reply to Re: Please explain: A hash of file handles peculiarity by repson
in thread Please explain: A hash of file handles peculiarity by ghor

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