pid() public

Returns the process ID of a child process associated with ios. This will be set by IO::popen. 

   pipe = IO.popen("-")
   if pipe
     $stderr.puts "In parent, child pid is #{pipe.pid}"
   else
     $stderr.puts "In child, pid is #{$$}"
   end

produces: 

   In child, pid is 26209
   In parent, child pid is 26209
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