add total bytes in iptables

Question

how can I add grep output number line by line.

I have the below output file from

     pkts      bytes target     prot opt in     out     source               destination
       0        0 RETURN     0    --  *      *       0.0.0.0/0            192.168.1.117
       0        0 RETURN     0    --  *      *       192.168.0.1          0.0.0.0/0
       0        0 RETURN     0    --  *      *       0.0.0.0/0            192.168.0.1
  375993 19581223 RETURN     0    --  *      *       192.168.1.136        0.0.0.0/0
  752537 1043650417 RETURN     0    --  *      *       0.0.0.0/0            192.168.1.136
     123     9348 RETURN     0    --  *      *       192.168.1.100        0.0.0.0/0
     121     9196 RETURN     0    --  *      *       0.0.0.0/0            192.168.1.100

I want to add all bytes for each IP address and store it as variable for further calculation.

iptables -L RRDIPT -vnx -t filter | grep "192.168.1" | cut -d " " -f4

gives me the blanks and 19581223,1043650417,9348 and 9196 but I am struggling to add the output.

Can anyone guide me?

Answer 1

awk will make short work of that.

Answer 2

The following script tallies up the byte counts per destination IP. If you want per source IP then change the $9 to $8

iptables -L ... | awk '!/destination/{a[$9]+=$2}END{for(item in a)printf("%s\tTotal bytes: %s\n",item,a[item])}'

Input

pkts      bytes target     prot opt in     out     source               destination
   0        1 RETURN     0    --  *      *       0.0.0.0/0            192.168.1.117
   0        2 RETURN     0    --  *      *       192.168.0.1          0.0.0.0/0
   0        3 RETURN     0    --  *      *       0.0.0.0/0            192.168.0.1
   0        4 RETURN     0    --  *      *       0.0.0.0/0            192.168.1.117
   0        5 RETURN     0    --  *      *       192.168.0.1          0.0.0.0/0
   0        6 RETURN     0    --  *      *       0.0.0.0/0            192.168.1.117
   0        7 RETURN     0    --  *      *       192.168.0.1          0.0.0.0/0

Output

192.168.0.1     Total bytes: 3
0.0.0.0/0       Total bytes: 14
192.168.1.117   Total bytes: 11