How to append the count of numbers in each line of text using awk?

Question

I have several very large text files and would like to append the count of numbers following by a space in front of each line. Could anyone kindly suggest how to do it efficiently using Awk?

Input:

10 109 120 200 1148 1210 1500 5201
9 139 1239 1439 6551
199 5693 5695

Desired Output:

8 10 109 120 200 1148 1210 1500 5201
5 9 139 1239 1439 6551
3 199 5693 5695

Answer 1

this will work for you:

awk '{$0=NF FS $0}7' file

Answer 2

You can use

awk '{print NF,$0}' input.txt

It says print number of field of the current line NF separated by current field separator , which in this case is a space then print the current line itself $0.