#!/bin/bash

cd /etc/network/

stty erase '^?'

write_interfaces()

{

echo "auto lo

iface lo inet loopback

auto eth0

iface eth0 inet static

address $

netmask 255.255.255.0

gateway $

" > interfaces

}

reboot_fun()

{

        echo "reboot now?(Y/N)"

        read reb_in 

        if [[ ${reb_in} = $'Y' || ${reb_in} = $'y' ]]

        then

                echo "reboot now"

                reboot

        else

                echo "pls reboot if you can not ping the IP"

        fi

}

ping_func()

{

        ping -c   $set_IP && result= || result=

        if [ $result -eq  ]

        then

        {

                echo "set Ip conflict"

                continue

                IP_INPUT=

        }

        fi

        if [ $result -eq  ]

        then

        {

                echo "IP is ok:$set_IP"

                write_interfaces $set_IP $GateWay

                /etc/init.d/networking reload

                /etc/init.d/networking restart

                echo "set ok"

                IP_INPUT=

        }

        fi

}

echo "set IP into the main.cpp"

IP_INPUT=

while [ $IP_INPUT -eq  ]

do

    echo "input IP"

    read set_IP -n

    if [[ $set_IP =~ ^([-]{,}|[-][-]|[-][-]|[-])\.([-]{,}|[-][-]|[-][-]|[-])\.([-]{,}|[-][-]|[-][-]|[-])\.([-]{,}|[-][-]|[-][-]|[-])$ ]]

    then

        echo "input gateway"

        read GateWay

        arr_IP=${set_IP//./ }

        arr_IP=($arr_IP)

        arr_gw=${GateWay//./ }

        arr_gw=($arr_gw)

        for arr in

        do

            if [ ${arr_IP[$arr]} == ${arr_gw[$arr]} ]

            then

                echo "arr_IP:${arr_IP[$arr]}"

            else

                echo "error IP :$set_IP"

                continue

            fi

        done

        ping_func

    fi

done

    reboot_fun