systemd units to periodically update currencies for the unit command line

UpdateUnitsCurrencies.md

From the Hacker News comment https://news.ycombinator.com/item?id=23778922

In case anyone else needs this:

systemctl edit units-currency-update.service

[Unit]
Description=Update units(1) currency rates
  
[Service]
Type=oneshot
Nice=19
ExecStart=/usr/bin/units_cur

systemctl edit units-currency-update.timer

[Unit]
Description=Update units(1) currency rates
  
[Timer]
OnCalendar=daily
AccuracySec=3h
Persistent=true
  
[Install]
WantedBy=timers.target

systemctl daemon-reload

systemctl enable units-currency-update.timer