timeout 2 bash -c '</dev/tcp/91.121.61.180/443 && echo Port is open || echo Port is closed' || echo Connection timeout Port is open ~  

timeout 2 bash -c '</dev/tcp/91.121.61.180/444 && echo Port is open || echo Port is closed' || echo Connection timeout bash: connect: Connexion refusée 
bash: /dev/tcp/91.121.61.180/444: Connexion refusée Port is closed