Shell脚本获取本地网卡IP、mac地址、子网掩码、dns IP、外网IP

#/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=eth0
mac=`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 $mac
echo $ip
echo $dns
echo $ext_ip