Slack Helper to send stdout or messages from bash/shell to Slack message API quickly

slackpost.sh

#!/bin/bash

## Defaults
SLACK_TOKEN="YOUR TOKEN"
CHANNEL="YOUR CHANNEL"
IN=""
MESS=""

while getopts c:m: flag
do
    case "${flag}" in
        m) MESS="${OPTARG}";;
    esac
done

if [ -z "$MESS" ]; then
    # Use stdout from pipe
    [ -t 0 ] && [ -t 2 ] && echo "No input specified" && exit 1
    IN="$(cat)"
elif [ ! -z "$MESS" ]
    # Use -m "message"
    IN="${MESS}"
else
    # Idk you didnt really specify anything did you
    echo "No input specified" && exit 1
fi

curl -H "Authorization: Bearer ${SLACK_TOKEN}" -s \
-H "Content-type: application/json; charset=utf-8" \
--data "{\"channel\":\"${CHANNEL}\",\"blocks\":[{\"type\":\"section\",\"text\":{\"type\":\"mrkdwn\",\"text\":\"*Message from $(hostname):*\n ${IN}\"}}]}" \
-X POST https://slack.com/api/chat.postMessage > /dev/null