$infile = "GCF.gbff"; 
$outfile = "a1.txt";
open(IN, $infile) or die "Failed to open $infile\n";
open (OUT, ">$outfile") or die "Failed to open $outfile\n";
$n=0;
while ($line = <IN>)  
{  
    chomp ($line); 
    $line =~ s/\r$//;
    if ( $line =~ /<\d+..>\d+/ )
       {	 ++$n;   my ($start, $stop) = ($1, $2);
                 print OUT "$start, $stop, $header";
       }
}
print STDERR"$n";					
sub header
{ 
    @geneID = split /\s+/, $start, $stop; 
    $header = "$fastaprompt$geneID[1]"; 
}
close (IN);
close (OUT);