#!/usr/bin/ruby
def __separator__
  puts "\n-----\n"
end
JARH = 'Just another Ruby hacker,'
__separator__
IO.popen("echo `echo #{JARH}`") do |pipe|
  print pipe.gets.chomp
end
__separator__
IO.popen('cat', 'w+') do |pipe|
  pipe.puts JARH
  print pipe.gets.chomp
end
__separator__
open('|cat', 'w+') do |pipe|
  pipe.print JARH
  print pipe.gets(',')
end
__separator__
pipe = IO.popen('cat', 'w+')
pipe.print JARH
pipe.close_write
print pipe.read
pipe.close
__separator__
print `echo #{JARH}`.chomp
__separator__
pid = Process.fork
if pid
  Process.waitpid(pid)
else
  exec("echo `echo #{JARH}` | tr -d '\n'")
end
__separator__
system("echo `echo #{JARH}` | tr -d '\n'")
__separator__
IO.popen('-', 'r') do |io|
  if io
    # parent
    print io.gets.chomp
    Process.wait
  else
    # child
    exec('echo', JARH)
    exit! # exec failed
  end
end
__separator__
in_r, in_w = IO.pipe
out_r, out_w = IO.pipe
fork do
  in_w.close
  STDIN.reopen(in_r)
  in_r.close
  out_r.close
  STDOUT.reopen(out_w)
  out_w.close
  exec('cat')
  exit! # exec failed
end
in_r.close
out_w.close
in_w.print JARH
in_w.close
print out_r.read
Process.wait
__separator__