use strict;
@ARGV == 2 or die "Usage: convert_to_rev_db <input> <output>";
open my $wr, '+>', $ARGV[1] or die "$!: couldn't open: $ARGV[1]";
use strict;
@ARGV == 2 or die "Usage: convert_to_rev_db <input> <output>";
open my $wr, '+>', $ARGV[1] or die "$!: couldn't open: $ARGV[1]";