came error from nc

Hi.  My name is Jamal.

I am from Azerbaijan.

When I tried open local port with "nc" and send to him "/usr/local/bin/bash"
came error.

nc -l 12345 -e /bin/bash , Error        ->       nc: getaddrinfo: servname
not supported for ai_socktype

in /etc/resolv.conf and /etc/hosts files checked all of was right.

Why is it so?

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