Notify Slack - Send notifications to a Slack Channel - http://arjon.es/2016/09/15/be-notified-on-slack-when-a-long-process-finishes/

notify-slack.sh

# Notify Slack - Send notifications to a Slack Channel
# Copyright (C) 2016  Gustavo Arjones (@arjones)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# 
# Full blog post here: http://arjon.es/2016/09/15/be-notified-on-slack-when-a-long-process-finishes/
# 
function notify-slack () {
  # Change the Icon when a notification is sent
  # 
  local SLACK_NOTIFY_ICON=":ghost:"
  
  if [ ! -f ~/.notify-slack-cfg ]; then
    echo "ERROR: A Webhook URL is required. Create yours here: https://my.slack.com/services/new/incoming-webhook/"
    echo "Once you have your KEY, please create a file at ${HOME}/.notify-slack-cfg containng only the KEY. Eg: T02TKKSAX/B246MJ6HX/WXt2BWPfNhSKxdoFNFblczW9"
    return
  fi

  local SLACK_MESSAGE="$1"
  local SLACK_WEBHOOK_SERVICE=$(head -1 ~/.notify-slack-cfg)
  local SLACK_URL=https://hooks.slack.com/services/${SLACK_WEBHOOK_SERVICE}
 
  case "${SLACK_MESSAGE}" in
    INFO*)
      SLACK_ICON=':information_source: '
      ;;
    WARN*)
      SLACK_ICON=':warning: '
      ;;
    ERROR*)
      SLACK_ICON=':bangbang: '
      ;;
    *)
      SLACK_ICON=''
      ;;
  esac
 
  local PAYLOAD="payload={\"text\": \"${SLACK_ICON}${SLACK_MESSAGE} from $(hostname)\", \"icon_emoji\": \"${SLACK_NOTIFY_ICON}\", \"username\": \"Bash Notifier\"}"

  curl -XPOST --data-urlencode "${PAYLOAD}" ${SLACK_URL} #&>/dev/null
  return 0
}