Live prices download from Alpha Vantage

get-prices.sh

#!/bin/bash

# precondition: jq installed
pkg="jq"
if [[ $(dpkg-query -W -f='${Status}' $pkg 2>/dev/null) != "install ok installed" ]];
then
  echo "$pkg package not found: installing"
  if sudo apt-get install -y $pkg;
  then
    echo "$pkg installation successful, continuing...";
  else
    echo "$pkg installation failed";
    exit 1
  fi
fi

if [ -z ${API_KEY} ]
then
  echo "API_KEY env variable is not set, exiting"
  exit 1
fi

function getPrice() #symbol
{
  local symbol="$1"
  curl -i -s -H "Accept: application/json" "https://www.alphavantage.co/query?function=TIME_SERIES_INTRADAY&interval=1min&apikey=${API_KEY}&symbol=${symbol}" \
    | sed -n '/{/,$p' \
    | jq '."Time Series (1min)" | to_entries[] | [.key, .value."4. close"] | .[1]'
}

function getFxPrice() #fromFx #toFx
{
  local from="$1"
  local to="$2"
  curl -i -s -H "Accept: application/json" "https://www.alphavantage.co/query?function=CURRENCY_EXCHANGE_RATE&apikey=${API_KEY}&from_currency=${from}&to_currency=${to}"
}

function calculateChange() #p1 #p2
{
  local p1="$1"
  local p2="$2"
  local precision="$3"
  echo "scale = 10; ($p1 - $p2)" | tr -d '"' | bc
}

function calculateChangePercents() #p1 #p2
{
  local p1="$1"
  local p2="$2"
  local precision="$3"
  echo "scale = 10; 100 * ($p1 - $p2) / $p1" | tr -d '"' | bc
}

function formatPrice() #name #serie #precision
{
  local name="$1"
  local prices="$2"
  local precision="$3"

  p1="$(echo ${prices} | cut -d ' ' -f2 | tr -d '"')"
  p2="$(echo ${prices} | cut -d ' ' -f1 | tr -d '"')"
  change="$(printf "%.${precision}f" $(calculateChange $p2 $p1 2))"
  percents="$(printf "%.${precision}f" $(calculateChangePercents $p2 $p1 2))"

  echo "$name"
  echo "last price: $(printf "%.${precision}f" $p2)"
  echo "change: $change  (${percents}%)"
  echo ""
}

formatPrice "S&P 500" "$(getPrice '^GSPC')" 2
sleep 5
formatPrice "NASDAQ 100" "$(getPrice '^IXIC')" 2
sleep 5
formatPrice "EUR/USD" "$(getPrice 'EURUSD')" 5
sleep 5
formatPrice "Bitcoin/USD" "$(getPrice 'BTCUSD')" 2
sleep 5
formatPrice "Apple" "$(getPrice 'AAPL')" 2
sleep 5
formatPrice "Tencent" "$(getPrice 'TCEHY')" 2
#sleep 5
#formatPrice "FTSE 100" "$(getPrice '^FTSE')" 2
#sleep 5
#formatPrice "DAX" "$(getPrice '^GDAXI')" 2
#sleep 5
#formatPrice "Hang Seng" "$(getPrice '^HSI')" 2

Output example:

$ ./get-prices.sh 
S&P 500
last price: 2747.41
change: -1.40  (-0.05%)

NASDAQ 100
last price: 7482.73
change: -1.98  (-0.03%)

EUR/USD
last price: 1.23060
change: 0.00000  (0.00000%)

Bitcoin/USD
last price: 8125.00
change: 0.00  (0.00%)

Apple
last price: 178.65
change: -0.13  (-0.07%)

Tencent
last price: 59.73
change: 0.01  (0.02%)

API keys can be generated for free from https://www.alphavantage.co/support/#support