gem install pwqgen.rb

$ pwqgen.rb --help
Usage: pwqgen.rb [options] [<length>]
Options:
  -h, --help      show this help message and exit
  -v, --version   show version and exit
<length>: Number of words in the passphrase. [default: 3]

require 'rubygems'
require 'pwqgen'
p Pwqgen.generate             # => "Image&Both-action"
p Pwqgen.generate 5           # => "Alaska_Union9Calf=domain&ever"
pgen = Pwqgen.new             # => #<Pwqgen::Generator:0x9f6ec40 ...>
p pgen.generate               # => "String5Rebel+horse"
p pgen.generate 2             # => "Easily2desist"