A little script to watch the evolution of your btc in another currency.
Edit btc_history.txt with the date, the number of your BTC and the current amount in your favorite currency.
Run the script: node update_btc.js
Add a cron to run the script daily: crontab -e
0 3 * * * /usr/local/bin/node /path/to/update_btc.js
The line above run your script each day at 3 am. /usr/local/bin/node = which node
You can change the currency, at the first line of update_btc.js, change EUR by your currency code. USD for instance.