How to sum up every 10 lines and calculate average using AWK?

Question

I have a file containing N*10 lines, each line consisting of a number. I need to sum up every 10 lines and then print out an average for every such group. I know it\'s doabl

Answer 1

Try something like this:

$ cat input 
1
2
3
4
5
6
2.5
3.5
4
$ awk '{sum+=$1} (NR%3)==0{print sum/3; sum=0;}' input 
2
5
3.33333

(Adapt for 10-line blocks, obviously.)