tcpblock_notify.sh

#!/bin/bash
tail -1 -f /var/log/system.log | while read line
do
    [[ "$line" == *tcpblock*block*connection* ]] &&  ( terminal-notifier -title tcpblock -message "$(echo $line | cut -d\  -f7-  | cut -d: -f1)" 1>/dev/null)
done