Immediately output stdout

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How can I immediately output stdout? stdout is going to print after all
input is complete.

require ‘open3’
def run(cmd)
Open3.popen3(cmd) do |stdin, stdout, stderr, thread|

Thread.new do
  stdout.each {|l| puts l}
end

Thread.new do
  while thread.alive?
    stdin.puts $stdin.gets
  end
end

thread.join

end
end

run (“ruby file_to_test.rb”)

file_to_test.rb:

puts “please, enter s”
puts “please, enter q”

s = gets.chomp!
q = gets.chomp!

puts s
puts q

The result after running main.rb is:

somestring
somestring2
please, enter s
please, enter q
somestring
somestring2

How can I immediately output stdout?

Set stdout to unbuffered. In your case:

stdout.sync = true

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