Ejemplos subshell, saber ips

#!/bin/bash
ipcmd=/sbin/ip
echo $( $ipcmd a | grep "2: eth0:" -A3  | grep inet   | awk '{print $2}' | cut -d "/" -f1) $($ipcmd a | grep "3: eth1:" -A3  | grep inet   | awk '{print $2}' | cut -d "/" -f1)