From: Roger Pack <rogerpack2005@...>
Date: 2011-05-13T22:48:27+09:00
Subject: Re: Shell pipeline in Ruby?

Roger Pack wrote in post #998434:
> In the spirit of the recent call for better ruby documentation, I wrote
> a
> writeup:
>
> 
http://en.wikibooks.org/w/index.php?title=Ruby_Programming/Running_Multiple_Processes&stable=0#Chaining_processes


Unfortunately it appears the wiki formatting is mangled in firefox, but 
works well in chrome :)

Here's the complete code snippet:


pipe_me_in, pipe_peer_out = IO.pipe
pipe_peer_in, pipe_me_out = IO.pipe

fork do
  STDIN.reopen(pipe_peer_in)
  STDOUT.reopen(pipe_peer_out)
  Kernel.exec("echo 33")
  # this line is never executed because exec moves the process
end
pipe_peer_out.close # file handles have to all be closed in order for 
the "read" method, below, to be able to know
# that it's done reading data, so it can return.  See also 
http://devver.wordpress.com/2009/10/22/beware-of-pipe-duplication-in-subprocesses/
pipe_me_in.read



There is a link in there to a blog describing ruby's shell class, 
perhaps you did not see it?

-r

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