Differences

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--- sed:change:change_lines_in_a_file [2021/01/21 01:21] – created peter
+++ sed:change:change_lines_in_a_file [2021/01/21 01:27] (current) – peter
@@ Line 2: / Line 2: @@
 This script will obtain the current IP address for different sites and update the /etc/hosts file with the correct IP address.
+It could be run through Cron to ensure that the host file keeps an updated list of IPs.
 ----
@@ Line 14: / Line 16: @@
 .2.3.4  strict.bing.com
 .2.3.4  forcesafesearch.google.com
+.2.3.4  safe.duckduckgo.com
 </file>
@@ Line 20: / Line 23: @@
 ----
-===== Script =====
+===== Script using dig =====
 <file bash update_hosts.sh>
@@ Line 38: / Line 41: @@
 update_ip_address strict.bing.com
 update_ip_address forcesafesearch.google.com
-</code>
+update_ip_address safe.duckduckgo.com
+</file>
+----
+===== Script using nslookup =====
+<file bash update_hosts.sh>
+#!/bin/bash
+update_ip_address() {
+file=/etc/hosts
+if [[ $(grep $1 $file) ]]; then
+	IP=$(nslookup -query=A $1 8.8.8.8 | grep 'Address:' | tail -1 | \
+		grep -oE '((1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])\.){3}((1?[0-9]?[0-9]|2[0-4][0-9]|25[0-5]))')
+	sed -i "/$1/ s/.*/$IP\t$1/g" $file
+fi
+}
+update_ip_address restrict.youtube.com
+update_ip_address restrictmoderate.youtube.com
+update_ip_address strict.bing.com
+update_ip_address forcesafesearch.google.com
+update_ip_address safe.duckduckgo.com
+</file>
 ----
@@ Line 51: / Line 78: @@
 .79.197.220  strict.bing.com
 .239.38.120  forcesafesearch.google.com
+.142.126.100  safe.duckduckgo.com
 </file>