or simply pumping in the entire file once(though not a good practice) and then filtering the first line. 
my @filelines=`cat $input_file`;print OUTFILE $filelines[0];

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In reply to Re^2: Obtaining header from file (first line) - printing to output file by gurpreetsingh13
in thread Obtaining header from file (first line) - printing to output file by dkhalfe

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