Ruby method to suppress output as desired on any platform. Credit: Avdi Grimm

suppress_output.rb

def suppress_output(out: true, err: false)
  null = open(File::NULL, "w")
  old_out = $stdout.dup
  old_err = $stderr.dup
  $stdout.reopen(null) if out
  $stderr.reopen(null) if err
  yield
ensure
  $stdout.reopen(old_out)
  $stderr.reopen(old_err)
end
 
puts "Starting up"
suppress_output do
  puts "BLAH BLAH BLAH YADDA YADDA LOREM IPSUM PEAS AND CARROTS"
  system %(ruby -e 'puts "EVEN MORE BLAH BLAH BLAH"')
end
puts "Shutting down"
 
# >> Starting up
# >> Shutting down