PiHole Log Filter

#!/bin/bash

#######################
#
# pihole log filter - 26-January-2022 - Hack5190 (at) protonmail (dot) com
#
# usage: tail -f /var/log/pihole.log | ~/monitor/highlight.sh 1.1.1.1 0.0.0.0
#
# 1.1.1.1 is the IP to trap / display - it will be highlighted in Yellow
# 0.0.0.0 will be highlight in Red to show blocked - use 127.0.0.1 to highlight forwarded requests
#
# FYI: the counter displayed between query results is the # of non-matching lines
#
#######################

# Text color
red=$(tput bold;tput setaf 1)
yellow=$(tput bold;tput setaf 3)

# The loop
reset=$(tput sgr0)
count=0
while read line; do
    if (echo $line | grep $1 > /dev/null) ; then
        printf "\r"
        read line_2
        echo $line | sed -ue "s/\($1\)/$yellow\1$reset/; s/\($2\)/$red\1$reset/"
        echo $line_2 | sed -ue "s/\($1\)/$yellow\1$reset/; s/\($2\)/$red\1$reset/"
    else
        (( count++ ))
        printf "%s\r" "$count"
    fi
done