Using jq example

heartbeat.sh

#!/bin/bash

cd /mnt/heartbeat

/usr/bin/docker exec heartbeat komodo-cli getinfo > www/heartbeat.json

bid=$(cat www/heartbeat.json | jq '.blocks')
notarized=$(cat www/heartbeat.json | jq '.notarized')
nhash=$(cat www/heartbeat.json | jq '.notarizedhash' | sed -e 's/"//g')
txid=$(cat www/heartbeat.json | jq '.notarizedtxid' | sed -e 's/"//g')
diff=$(cat www/heartbeat.json  | jq '.difficulty')

let "blockid = $bid - 3"
blockhash=$(/usr/bin/docker exec heartbeat komodo-cli getblockhash $blockid)

printf "Block $blockid: $blockhash\nDifficulty: $diff\nNotarized $notarized: $nhash\nBTC tx: http://blockr.io/tx/info/$txid" | /mnt/heartbeat/slacktee.sh > /dev/null 2> /dev/null