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33

netcat

• One of my best inventions was netcat

        netcat hostname port

• It would open and connect a network socket

• Then it would copy stdin into the socket

• and copy the socket's replies to stdout

• For example, you could implement finger like this:

      #!/bin/sh
      echo $1 | netcat $2 79  

• (The finger protocol was pretty simple.)

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Copyright © 2011 M. J. Dominus