SilentUI is a UI choice that is absolutely silent.
The SilentUI has no arguments as it does not use any stream.
# File rubygems/user_interaction.rb, line 683 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