wget https://raw.githubusercontent.com/quydang04/cloudflare-ddns-update/main/cloudflare_ddns_update.sh
chmod +x cloudflare_ddns_update.sh
./cloudflare_ddns_update.sh
crontab -e
*/3 * * * * /path/to/cloudflare_ddns_update.sh > /dev/null
nano cloudflare_ddns_update.sh
vim cloudflare_ddns_update.sh