post-to-slack.sh

#!/bin/bash
function post_to_slack () {
  # format message as a code block ```${msg}```
  SLACK_MESSAGE="\`\`\`$1\`\`\`"                    
  SLACK_URL= # [URL of The Channel you want to post to]                           
  case "$2" in
    INFO)
      SLACK_ICON=':slack:'
      ;;
    WARNING)
      SLACK_ICON=':warning:'
      ;;
    ERROR)
      SLACK_ICON=':bangbang:'
      ;;
    *)
      SLACK_ICON=':slack:'
      ;;
  esac

  curl -X POST --data "payload={\"text\": \"${SLACK_ICON} ${SLACK_MESSAGE}\"}" ${SLACK_URL}                         
}

"$@" # will expand to the arguments of the command line you specify