Grab numbers from file and add together

Question

I have a file like this
file A :

min:353 max:685 avg:519
min:565 max:7984 avg:4274
min:278 max:5617 avg:2947
min:624 max:6768 avg:3639
min:27 max:809 avg:418
min:809 max:3685 avg:2247
min:958 max:2276 avg:1617

I trying to get last two line of avg numbers to ad them together.
Like 2247+1617 than output the value 3864. How can I achieve it?

So far my code is like this : (sorry for limited knowledge)

tail -n 2 file.A | awk -F '[: ]' '{print $6}'

Answer 1

You seem to want to add the last field. This would add the last field to a variable. The END block is executed after the input is exhausted, so sum would be printed at the end:

tail -2 file.A | awk -F: '{sum+=$NF}END{print sum}'

Answer 2

Here is an awk only

awk -F: 'FNR==NR {n=NR;next} FNR>n-2 {sum+=$NF}END{print sum}' file.A{,}
3864

Or you can just sum the two last value:

awk -F: '{f=s;s=$NF}END{print s+f}' file.A
3864

Answer 3

Similar approach as devnull's answer but using tac.

tac file.A | awk -F: '{sum+=$NF}NR==2{print sum;exit}'
3864

• tac reverses the file
• Using awk we sum the last column ($NF).
• When line number is 2 we print the sum and exit.