@lines = map {
        /(\/\w+\/\w+)\s+\w+\s+\d+\s+\d+\s+(\d+)\s+(\d+)%/;
        {
43                volume => $1,
                available => $2,
                free => 100 - $3,
        }
        } split /\n/, $space{ $host };

        #This is the sorting line!
50      @lines = sort { $b->{available} <=> $a->{available} } @lines;

52      push @out, "$host:$_->{volume}    $_->{available}    $_->{free}%" for @lines;