check if a port is opened without using telnet

On several machines in a corporate SI, telnet is not installed, so your usual telnet HOST PORT command is not working.

You can replace that with a netcat command :

[root@dn25 ~]# nc -z 8020
Connection to 8020 port [tcp/intu-ec-svcdisc] succeeded!

Hint : use the -u option to specify a UDP port.

So, what do you think ?

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