sorted

files/bashscripts/debian/debian-change-ip.sh

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+#!/bin/bash
+
+# ask to set static ip address
+read -r -p "Set Static IP address? <y/N> " prompt
+if [[ "${prompt,,}" =~ ^(y|yes)$ ]] ; then
+    read -r -p "Enter Static IP Address with subnet prefix: " staticip
+    read -r -p "Enter Gateway IP Address: " gatewayip
+    read -r -p "Enter Primary DNS IP Address: " dnsip1
+    # get adapter name
+    name=$(basename /sys/class/net/e*)
+    # backup original interfaces file
+        if [[ ! -f /etc/network/interfaces.bak ]] ; then
+            cp /etc/network/interfaces /etc/network/interfaces.bak
+        fi
+    rm /etc/network/interfaces
+    cp /etc/network/interfaces.bak /etc/network/interfaces
+    # set static ip
+    sed -i "s,^iface $name inet dhcp*,iface $name inet static," /etc/network/interfaces
+    echo "        address $staticip" >> /etc/network/interfaces
+    echo "        gateway $gatewayip" >> /etc/network/interfaces
+    # backup resolv.conf file
+        if [[ ! -f /etc/resolv.conf.bak ]] ; then
+            cp /etc/resolv.conf /etc/resolv.conf.bak
+        fi
+    rm /etc/resolv.conf
+    # set primary dns ip
+    echo "nameserver $dnsip1" >> /etc/resolv.conf
+    # ask for secondary dns ip
+    read -r -p "Set Secondary DNS IP Address? <y/N> " prompt
+        if [[ "${prompt,,}" =~ ^(y|yes)$ ]] ; then
+            read -r -p "Enter Secondary DNS IP Address: " dnsip2
+            echo "nameserver $dnsip2" >> /etc/resolv.conf
+        fi
+    # restart the interface
+    ifdown $name
+    ifup $name
+fi