SilentUI is a UI choice that is absolutely silent.

Methods
C
N
Class Public methods
new()

The SilentUI has no arguments as it does not use any stream.

Source: show | on GitHub 

# File lib/rubygems/user_interaction.rb, line 676
def initialize
  reader, writer = nil, nil

  begin
    reader = File.open('/dev/null', 'r')
    writer = File.open('/dev/null', 'w')
  rescue Errno::ENOENT
    reader = File.open('nul', 'r')
    writer = File.open('nul', 'w')
  end

  super reader, writer, writer, false
end
Instance Public methods
close()

Source: show | on GitHub 

# File lib/rubygems/user_interaction.rb, line 690
def close
  super
  @ins.close
  @outs.close
end