threads = []
(1..5).each do |i|
  threads << Thread.new { `process x#{i}.bin` }
end
threads.each do |t|
  t.join
  # i'd like to get the output of the process command now.
end

threads = []
(1..5).each do |i|
  threads << Thread.new { Thread.current[:output] = `echo Hi from thread ##{i}` }
end
threads.each do |t|
  t.join
  puts t[:output]
end

puts t.value

#!/usr/bin/env ruby
threads = (1..5).collect do |i|
  Thread.new { `echo Hi from thread ##{i}` }
end
threads.each do |t|
  puts t.value
end

Hi from thread #1
Hi from thread #2
Hi from thread #3
Hi from thread #4
Hi from thread #5

a, b, c = [
  Thread.new { "something" },
  Thread.new { "something else" },
  Thread.new { "what?" }
].map(&:value)

a # => "something"
b # => "something else"
c # => "what?"

threads = (1..5).collect do |i|
  Thread.new { `echo x#{i}.bin` }
end
threads.each do |t|
  puts t.value
end