#/usr/bin/env bash# Name: get_network_info.sh# Author: Purple_Grape# This is a script to gather network information of your Linux system.# Test under Ubuntu 10.04 only.#----------------------------NIC=eth0MAC=`LANG=C ifconfig $NIC | awk '/HWaddr/{ print $5 }' `IP=`LANG=C ifconfig $NIC | awk '/inet addr:/{ print $2 }' | awk -F: '{print $2 }'`MASK=`LANG=C ifconfig $NIC | awk -F: '/Mask/{print $4}'`ext_ip=`curl ifconfig.me`if [ -f /etc/resolv.conf ];then   dns=`awk '/^nameserver/{print $2}' /etc/resolv.conf `fi#----------------------------echo "Your network information is as below:"echo $MACecho $IPecho $dnsecho $ext_ip