Dites adieu à Telnet !

Voir :

• Stop using Telnet to test ports

Lire

cat < /dev/tcp/127.0.0.1/22

Tester la connexion

echo > /dev/tcp/127.0.0.1/22

exec 3<>/dev/tcp/www.google.com/80
echo -e "GET / HTTP/1.1\r\nhost: http://www.google.com\r\nConnection: close\r\n\r\n" >&3
cat <&3
exec 3>&-

timeout 1 bash -c " echo > /dev/tcp/${HOST}/${PORT} " > /dev/null 2>&1 && echo "Port ${PORT} is open" || echo "Port ${PORT} is closed"

Ou encore

curl -v telnet://127.0.0.1:22