Run this script to get updated BTC price in MXN pesos. If it raises it prints green, if lowers, red, and if stays the same it won't print until it gets a new one. It requires python to parse the json response. It checks every 3 seconds.

bitso_ticker_btcmxn.sh

#!/bin/bash

function get_json_val () { 
  python -c "import json,sys;sys.stdout.write(json.dumps(json.load(sys.stdin)$1))"; 
}
function print_red () {
  printf "\033[0;31m$1\033[0m"
  echo ""
}
function print_green () {
  printf "\033[0;32m$1\033[0m"
  echo ""
}

function ticker () {
  curl -s "https://api.bitso.com/v3/ticker/?book=btc_mxn" > bitcoin_response.json
  LAST_LAST=$(cat bitcoin_response.json | get_json_val "['payload']['last']")
  LAST_LAST=$(sed -e 's/^"//' -e 's/"$//' <<<"$LAST_LAST")
  print_green $LAST_LAST
  sleep 3000
  while true; do
    curl -s "https://api.bitso.com/v3/ticker/?book=btc_mxn" > bitcoin_response.json
    TIMESTAMP=$(cat bitcoin_response.json | get_json_val "['payload']['created_at']")
    LAST=$(cat bitcoin_response.json | get_json_val "['payload']['last']")
    LAST=$(sed -e 's/^"//' -e 's/"$//' <<<"$LAST")
    if (( $(echo "$LAST > $LAST_LAST" |bc -l) )); then
      print_green $LAST
    fi
    if (( $(echo "$LAST < $LAST_LAST" |bc -l) )); then
      print_red $LAST
    fi
    LAST_LAST=$LAST
    sleep 3000
  done
}

ticker