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next if $op_target eq '' or ! defined $op_target;
printf "$user_ip_addr $username - " . "[%02d/$months[$date_mon]/$century%02d:%08d $utc_offset] " . qq{"$op_name $op_target" $service_status_code $bytes_sent "-" " +-"\n}, $date_dd, $date_year, $time;