Imprime índices econômicos direto no terminal. Compatibilidade POSIX: testado em sh, bash e zsh.

indices.sh

#!/bin/bash
#
# indices.sh - version 1.7 - 2026-01-28
# Copyright (c) 2024, 2025, 2026 Daniel Dias Rodrigues <[email protected]>.
# No rights reserved.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the Creative Commons Zero 1.0 Universal (CC0 1.0) Public
# Domain Dedication (https://creativecommons.org/publicdomain/zero/1.0/).
#
URL_DOLAR="https://www.exchange-rates.org/pt/historico/usd-brl"
URL_EURO="https://www.exchange-rates.org/pt/historico/eur-brl"
URL_OURO="https://pt.bullion-rates.com/gold/BRL-history.htm"
URL_BTC="https://api.binance.com/api/v3/ticker/price?symbol=BTCBRL"
URL_DOLAR_REALTIME="https://www.xe.com/currencyconverter/convert/?Amount=1&From=USD&To=BRL"
URL_EURO_REALTIME="https://www.xe.com/currencyconverter/convert/?Amount=1&From=EUR&To=BRL"

_validContent(){
    local CONTENT="$(wget -qO- $1)"
    local CURRENT=""

    local COUNT=0
    while [ -z "$CURRENT" ]; do
        COUNT=$(($COUNT + 1))
        DATE=$(date -d "$(date +%F) -$COUNT day" +%x) # 27/01/2026 (ontem)
        CURRENT=$(echo "$CONTENT" | grep "$DATE" -A3 | tail -n 1)
    done

    COIN=$(echo "$CURRENT" | sed -e 's/.*">//g' -e 's/ BRL.*//g')

    echo "$DATE $COIN"
}

USD=$(_validContent "$URL_DOLAR")
USD_DATE=$(echo "$USD" | cut -d' ' -f1)
USD_COIN=$(echo "$USD" | cut -d' ' -f2)

EURO=$(_validContent "$URL_EURO")
EURO_DATE=$(echo "$EURO" | cut -d' ' -f1)
EURO_COIN=$(echo "$EURO" | cut -d' ' -f2)

GOLD_CONTENT="$(wget -qO- $URL_OURO)"
GOLD_CURRENT="$(echo "$GOLD_CONTENT" | grep "$(date +%d/%m/%y)" -A2)"
while [ -z "$GOLD_CURRENT"  ]; do
    COUNT=$(($COUNT + 1))
    GOLD_DATE=$(date --date="$(date +%F) -$COUNT day" +%d/%m/%y)
    GOLD_CURRENT=$(echo "$GOLD_CONTENT" | grep "$GOLD_DATE" -A2)
done
if [ -z "$GOLD_DATE" ]; then
    GOLD_DATE=$(date +%x)
else
    GOLD_DATE=$(echo "$GOLD_DATE" | sed -r 's/(.{6})/\120/')
fi
GOLD_clear=$(echo "$GOLD_CURRENT" | tail -2 | sed -e 's/ //g' \
    -e 's/<.*\">//g' -e 's/<.*//g')
GOLDg=$(echo "$GOLD_clear" | head -1)
GOLDoz=$(echo "$GOLD_clear" | tail -1)

# Current values
btc_section=$(wget -qO- "$URL_BTC" | sed -r 's/[[:alpha:]:",\{\}]//g' | \
    awk '{printf "%.2f\n", $1}')
btc=$(echo "$btc_section" | \
    awk '{printf "%\047d,%s\n", $1, substr($1, length($1)-1)}')

_validRealtime(){
    local RATE=$(wget -qO- "$1" | grep -oP "1 $2 =.{8}" | \
        sed -e "s/1 $2 = //" -e 's/\./,/')
    echo "$RATE"
}

usd=$(_validRealtime "$URL_DOLAR_REALTIME" "USD")

eur=$(_validRealtime "$URL_EURO_REALTIME" "EUR")

echo "Valores históricos
==================

Dólar¹           | Euro¹           | Ouro²
    (${USD_DATE}) |    (${EURO_DATE}) |    (${GOLD_DATE})
    R$ ${USD_COIN}    |    R$ ${EURO_COIN}    |    R$    ${GOLDg}/g
                                   |    R$ ${GOLDoz},00/oz

Valores correntes
=================
    1,00 USD³ = R$ ${usd}
    1,00 EUR³ = R$ ${eur}
    1,00 BTC⁴ = R$ ${btc}

Fontes:
 ¹ www.exchange-rates.org
 ² pt.bullion-rates.com
 ³ xe.com
 ⁴ api.binance.com"