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  • What operating system? Commented Jul 14, 2016 at 14:34
  • Fedora 23 i686. Sorry, forgot to mention. I updated the post. Commented Jul 14, 2016 at 14:36
  • 2
    A command directs to stdout by default, unless you redirect to somewhere else. Commented Jul 14, 2016 at 14:44
  • When I do nc -l -p 25566 -c "ls -l /proc/self/fd" I get the socket attached to fd/0 and fd/1 this is what I expected. Commented Jul 14, 2016 at 14:49
  • Can you show us EXACTLY what you are doing and what happens. I mean EXACTLY, type in what you did, then do it based on exactly what you typed, then paste the result. (I am detecting noise between what happened and what is appearing here.) Commented Jul 14, 2016 at 14:52