Capture/Suppress output via STOUT, STDERR, etc

Capture_output.md

Suppress all outputs:

quietly { puts 'this message will not be shown'}

Suppress outputs except error messages (eg STDERR):

silence_stream(STDOUT) do
  puts 'This will never be seen'
end

puts 'But this will'

Capture the outputs:

stream = capture(:stdout) { puts 'notice' }
stream # => 'notice'