Namecheap DDNS updater for pfsense, this one had to be updated for tcsh. Most public ones are written for bash

namecheap_ddns_updater_pfsense.sh

#!/bin/tcsh

# Shell script to update namecheap.com dynamic dns
# from a pfsense Firewall, had to be adapted from other bash solutions

set DOMAIN=''
set PASSWORD=''
set HOSTNAME=''
set EMAIL=''
set CACHED_IP_FILE='./namecheap_ddns_ip.txt'
set CACHED_IP_FILE_HISTORY='./namecheap_ddns_ip_history.txt'
set LAST_CURL_OUTPUT='./namecheap_response.txt'
set DATE=`date +%Y%m%d`

set CURRENT_IP=`curl -s ifconfig.co`


set UPDATE_IP="false"
if ( -e $CACHED_IP_FILE ) then
   set FILE_IP=`cat $CACHED_IP_FILE`
   if ($FILE_IP == $CURRENT_IP) then
       echo "IP has not changed"
   else
       set UPDATE_IP="true"
   endif
else
   echo $CURRENT_IP > $CACHED_IP_FILE
   set UPDATE_IP="true"
endif 

if ($UPDATE_IP == "true") then
    #set REQUEST='https://dynamicdns.park-your-domain.com/update?host=$HOSTNAME&domain=$DOMAIN&password=$PASSWORD&ip=$CURRENT_IP'
    curl -s "https://dynamicdns.park-your-domain.com/update?host=$HOSTNAME&domain=$DOMAIN&password=$PASSWORD&ip=$CURRENT_IP" -o $LAST_CURL_OUTPUT
    echo "IP WAS UPDATED"
    #echo $RESPONSE
    printf "$DATE\t${CURRENT_IP}" >> $CACHED_IP_FILE_HISTORY
endif