checkmyplaces.rb

require 'yaml'
require 'rubygems'
require 'net/ssh'
require 'net/ssh/version'

places = YAML.load_file('places.yaml')
threads = []

places.each do |place|
  threads << Thread.new(place) do |p|
    Net::SSH.start(p[:host], p[:login], :password => p[:password]) do |ssh|
      puts "connected to #{p[:host]}"
#      puts ssh.to_yaml
      uptime = ssh.exec!("uptime")
      puts uptime
    end
  end
end


threads.each { |t| t.join }

output.txt

$ ruby checkmyplaces.rb 
connected to eeebox.fridim.org
/usr/lib/ruby/1.8/net/ssh/session.rb:199:in `method_missing': undefined method `exec!' for #<Net::SSH::Session:0xb76fea5c> (NoMethodError)
	from checkmyplaces.rb:21:in `join'
	from checkmyplaces.rb:21
	from checkmyplaces.rb:21:in `each'
	from checkmyplaces.rb:21