shell获取本地网卡IP，mac，掩码，dns，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