Parsing data from ifconfig with awk or sed?

Question

I am trying to parse some data from ifconfig output with sed, but I am not able to do it correctly. I want the command to extract just the number I am after.

For exa

Answer 1

use grep:

ifconfig | grep -oP '(?<=RX bytes:)[0-9]*'

use awk:

ifconfig | awk -F: '/RX bytes/{print $2+0}'