tailコマンドでログを監視して、slackにアラート投げる ref: http://qiita.com/tamanugi/items/575d873546355a6edff7

file1.txt

$ ./slack_alert.sh output.log

slack_alert.sh

#!/bin/sh

slack_alert() {
  while read i
  do
    echo $i | grep -q "Finish."
    if [ $? = "0" ];then
        curl -X POST -H 'Content-type: application/json' \
        --data '{"text":"Finish!!"}' \
        https://hooks.slack.com/services/{Incoming Webhook URL}
    fi
  done
}

tail -n 0 --follow=name --retry $1 | slack_alert