CODEWITHSUNDEEP
bashshelltelnet
Gaurav
Gaurav

Reputation: 114

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

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.

Upvotes: 4

Views: 6412

Answers (4)

William T Froggard
William T Froggard

Reputation: 738

I have found that using nc (netcat) instead of telnet works nicely for simple commands:

echo "command to send"|nc host 1234

Upvotes: 1

TheJamaicanGuy
TheJamaicanGuy

Reputation: 41

echo the command(s) you want to send, then use cat to keep the connection open.

{ echo "commands to send"; cat -; } | telnet localhost 8080

While the connection is open, you can type commands as usual, but you cannot send the escape character to telnet.

To close the connection, press Ctrl+C.

Upvotes: 1

Julio
Julio

Reputation: 115

Try eval:

eval "{ echo; 
        sleep 5;
        echo 'xvz'; 
        sleep 10; }" | telnet your_host

Use sleeps to keep open the connection; try different delay times.

Upvotes: 0

Chul-Woong Yang
Chul-Woong Yang

Reputation: 1243

telnet does not process standard input and standard output.

You should check other programs like 'expect'.

Upvotes: 1

Related Questions