Update/Install Hetrixtools iptables ping rules

hetrix-update.sh

#!/bin/bash

if [ -z "$1" ]; then
          echo
          echo "Please pass either 'install' or 'update' as parameter"
          echo

elif [ $1 = "update" ]; then
          echo "---------------------"
          echo "Updating hetrix rules"
          echo "---------------------"
          wget https://hetrixtools.com/resources/uptime-monitor-ips.txt
          iptables -F hetrix
          cat uptime-monitor-ips.txt | sed 's/\s.*$//' | sed 's/com/com -j ACCEPT/g' | xargs -t -l1 iptables -A hetrix -s
          rm uptime-monitor-ips.txt
          echo
          echo "All done"

elif [ $1 = "install" ]; then
          echo "--------------------------------------------"
          echo "Installing a new Hetrix chain and filling it"
          echo "--------------------------------------------"
          iptables -N hetrix
          wget https://hetrixtools.com/resources/uptime-monitor-ips.txt
          cat uptime-monitor-ips.txt | sed 's/\s.*$//' | sed 's/com/com -j ACCEPT/g' | xargs -t -l1 iptables -A hetrix -s
          rm uptime-monitor-ips.txt
          iptables -I INPUT -p icmp -m icmp --icmp-type any -m state --state NEW -j hetrix
          echo
          echo "All done"
else
          echo "Wrong parameter set"
fi