Script to update pihole gravity list from firebog.net and automatically add/remove entries. Runs on cronjob weekly without additional addons. Based on a Reddit comment with small tweaks, source: https://www.reddit.com/r/pihole/comments/mxf6rp/comment/gvq1rn3/

pihole-update-gravity-lists.sh

#!/bin/bash

#This will pull the list of ticked from firebog, removes outdates lists, and then updates the sqlite db before updating gravity
#Based on this Reddit Comment with a slight fix to the if logic as default behaviour was space breaking:
#https://www.reddit.com/r/pihole/comments/mxf6rp/comment/gvq1rn3/
#
#This is being run from crontab by root (required for pihole command)
#Command:       crontab -u root -e
#Runs on Satuday morning at 3:34am
#34 3 * * 6 /opt/pihole-custom/update-lists.sh > /opt/pihole-custom/updatelist.log 2>&1

sqlite3 /etc/pihole/gravity.db "SELECT Address FROM adlist" |sort -u > ./pihole.list
wget -qO - https://v.firebog.net/hosts/lists.php?type=tick |sort -u > ./src.list
diff -q ./pihole.list ./src.list 1>/dev/null  2>&1
if [ $? == "1" ]; then
        comm -23 ./pihole.list ./src.list | xargs -I{} sudo sqlite3 /etc/pihole/gravity.db "DELETE FROM adlist WHERE Address='{}';"
        comm -13 ./pihole.list ./src.list |xargs -I{} sudo sqlite3 /etc/pihole/gravity.db "INSERT INTO adlist (Address,Comment,Enabled) VALUES ('{}','Scrip$        pihole restartdns reload-lists
        pihole -g
fi