Enables SSH connection without password authentication

ssh_without_password.rb

#!/usr/bin/env ruby -w

unless ARGV[0]
  puts 'Please input USERNAME@HOSTNAME for the argument.'
  exit
end

pwd = `echo ~`.strip
key_file = "#{pwd}/.ssh/id_rsa.pub"
unless File.exists?(key_file)
  `ssh-kygen -t rsa`
end

`ssh #{ARGV[0]} mkdir -p .ssh`
`cat #{pwd}/.ssh/id_rsa.pub | ssh #{ARGV[0]} 'cat >> .ssh/authorized_keys'`