According to this thread: 
http://ubuntuforums.org/showthread.php?t=1792546
the manual TALKING TO SERVERS example: 
$ echo -n "GET / HTTP/1.0\r\n\r\n" | nc host.example.com 80
does not work unless -q-1 is specified in nc, but it works for nc in 
netcat-traditional. It appears that nc in netcat-openbsd ends immediately after 
it sends the echoed string to the server. 

Also, echo -e is required, so the manual should also be corrected. This
is also the case for netcat-traditional.

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https://bugs.launchpad.net/bugs/545075

Title:
  Netcat-openbsd package from ubuntu-minimal doesn't work with echo

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