How to pipe a string to netcat and then keep connection open?

Question

I want to connect to a remote a server using netcat (or something similar), send a string which I want to echo from command-line, and then want to keep connection open. I tried different variation of piping echo or cat to netcat, but none worked. How can I achieve the same on Ubuntu 16.04, 64 bit?

".... and then I want to keep the connection open". In order to do what? Why? — Mark Setchell
– Mark Setchell, Commented May 17, 2018 at 6:34

nbari · Accepted Answer · 2018-05-22 13:10:51Z

1

To keep the netcat listening you could use the option -k, from the man:

-k      Forces nc to stay listening for another connection after its 
        current connection is completed.  It is an error to use this 
        option without the -l option.

You could use something like:

nc -lk 8080

answered May 22, 2018 at 13:10

nbari

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