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+Bash script and systemd service to update Hurricane Electric's free dynamic
+dns service. It uses curl.
+
+```bash
+git clone https://gitlab.com/rascul/he-ddns
+cd he-ddns
+sudo install -o root -g root -m 0755 he-ddns /usr/local/bin
+sudo install -o root -g root -m 0644 he-ddns?@.{service,timer} /etc/systemd/system
+sudo mkdir -p /etc/he-ddns
+echo "some_key" | sudo tee /etc/he-ddns/some_domain
+sudo chmod 0600 /etc/he-ddne/some_domain
+sudo systemctl daemon-reload
+sudo systemctl enable --now he-ddns4@some_domain.service
+sudo systemctl enable --now he-ddns6@some_domain.service
+```