gistfile1.rb

desc "setup external displays"                                                
task :displays do                                                             
  system("xrandr --output VGA --mode 1024x768")                               
  system("xrandr --output VGA --same-as LVDS")                                
end 

desc "perform presentation"                                                   
task :perform => :displays do                                                 
  options = "--transition Crossfade --transtime 250 -c persistent"            
  command = "keyjnote #{options} @#{File.dirname(__FILE__)}/order.txt"        
  system(command)                                                             
end