Shell script gets the local network card IP, MAC address, subnet mask, DNS IP, extranet ip_linux shell

#/usr/bin/env Bash

# Name:get_network_info.sh
# author:purple_grape # This was
a script to gather network inf Ormation of your Linux system.
# Test under Ubuntu 10.04 only.

#----------------------------
nic=eth0
mac= ' lang=c ifconfig $NIC | awk '/hwaddr/{print $} ' ip=
' lang=c Ifconfig $NIC | awk '/inet addr:/{print $} ' |  Awk-f: ' {print $} '
mask= ' lang=c ifconfig $NIC | awk-f: '/mask/{print $} ' ext_ip=
' curl ifconfig.me '

if [-f/etc/resolv.conf];
Then
   dns= ' awk '/^nameserver/{print $} '/etc/resolv.conf '
fi
#----------------------------
echo "Your network information is as below:"
echo $MAC echo
$IP echo
$dns
echo $ext _ip