Posting for personnel reference:
Following script was made to update ddns record at changeip.com from Linux base pc using bash. I found script on net as well, but didn’t worked the way i wanted, So I made one myself. Simple yet effective!
#!/bin/bash # Changeip.com Script for Linux base systems using bash # Created to suite local need in specific case. Well tested with CENTOS 6.x n UBUNTU 12.x # Syed . Jahanzaib . aacable at hotmail dot com # October , 2015 # Uncomment below to view debug log # set -x # Various variables, make sure to change the changeip.com credentials and hostname as required. CIPUSERemail@example.com CIPPASS=PASSWORD CIPHOST=changeip_password URL="https://nic.changeip.com/nic/update?ip" # Temp files and log file to record updates if required EXTIP="/tmp/externalip.txt" NEWIP="/tmp/newip.txt" LOG="/var/log/changeip.log" DATE=`date` # If external ip text file not found, then create one if [ ! -e "$EXTIP" ] ; then touch "$EXTIP" fi # Download current LIVE ip from intenret to match with old ip wget -q -O /tmp/newip.txt http://ip.changeip.com:8245 a=`cat $EXTIP` b=`cat $NEWIP | cut -f 2 -d "=" | cut -f 1 -d "-" -s | grep -m 1 ^` if [[ $a != "$b" ]] then # changeip update now curl "$URL=$b&u=$CIPUSER&p=$CIPPASS&hostname=$CIPHOST" # Update New WAN IP in OLD File echo $b > $EXTIP echo # Print OLD vs New Comparision for REVIEW echo Old IP = $a echo New IP = $b echo Update Time = $DATE echo Update Done. # Print OLD vs New Comparision for REVIEW in LOG FILE for later review echo "*********************************************" >> $LOG echo New IP FOUND > $LOG echo Old IP = $a >> $LOG echo New IP found at $DATE and IP is = $b >> $LOG # IF OLD and NEW ip are same, then no need to update, just EXIT else echo $DATE / No need to change IP. DDNS BASH Script / Powered by Syed Jahanzaib fi # END