tail-slack.sh: http://blog.getpostman.com/2015/12/23/stream-any-log-file-to-slack-using-curl/

tail-slack.sh

#!/bin/bash
 
tail -n0 -F "$1" | while read LINE; do
  (echo "$LINE" | grep -e "$3") && curl -X POST --silent --data-urlencode \
    "payload={\"text\": \"$(echo $LINE | sed "s/\"/'/g")\"}" "$2";
done