print qq{ask_bigdb [options] >> $filename\n}; ### OFFENDING LINE!!! #### my @lines = ask_bigdb(@options); # whatever that ask_bigdb is... shift @lines; # get rid of header open my $outfh, '>>', $filename # append to file or die "Can't append to '$filename': $!\n"; print $outfh @lines; close $outfh or die "Can't close '$filename': $!\n"; #### redo; # do the next arm of chromosome ...