Hi all,
I wrote a small linux command line tool as a bash scripting learning project; it uses the CoinGecko-API and is capable of displaying all their supported crypto-currencies, as well as cross-currencies (>50 at the moment, including some cryptos and commodities gold and silver).
It can be found here:
https://github.com/fatrattombala/bash-btc-quote
An older, simpler and therefore faster version (also accessible on github) uses the Kraken-API and shows only BTC and ETH.
Enjoy!