What happens when I pipe any command to a telnet session , why does the session closes

Question

What happens when I pipe any command to a telnet session , why does the session closes . How can I give a command which can be processes instead of closeing the connection .

I am trying

echo "xvz" | telnet 0 abc Trying 0.0.0.0... Connected to 0. Escape character is '^]'.

Which terminates the session instead of process xyz , what is other way i also tried

telnet 0 xyz < test
Trying 0.0.0.0... Connected to 0. Escape character is '^]'. Connection to 0 closed by foreign host.

Answer 1

telnet does not process standard input and standard output.

You should check other programs like 'expect'.