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command you gave 


					
		
		
ruby -e 'system %(ruby -e "require \"readline\"")'

				
		

		

	
	





wtf is it anyway? 





	
	

		

		

			
				
				

					
		
		
>> ^Deuler:rubinius brian$ ruby -e 'p %(ruby -e "require \"readline\"")'
"ruby -e \"require \"readline\"\""

				
		

		

	
	





hmm 





	
	

		

		

			
				
				

					
		
		
euler:rubinius brian$ ruby -e 'p %(ruby -e "require \"readline\"")'
"ruby -e \"require \"readline\"\""
euler:rubinius brian$ irb
>> sytem "ruby -e \"require \"readline\"\""
NoMethodError: undefined method `sytem' for main:Object
        from (irb):1
>> system "ruby -e \"require \"readline\"\""
^C-e:1:in `readline': Interrupt
        from -e:1
=> false
euler:rubinius brian$ irb
>> system 'ruby -e "require \"readline\""'
=> true
>> system %(ruby -e 'require "readline"')
=> true
>> "ruby -e \"require \"readline\"\""
=> "ruby -e \"require \"readline\"\""
>> system "ruby -e \"require \"readline\"\""
^C-e:1:in `readline': Interrupt
        from -e:1
=> false

				
		

		

	
	





is it not a tty? 





	
	

		

		

			
				
				

					
		
		
euler:rubinius brian$ ruby -e 'system %(ruby -e "p STDIN.tty?; require \"readline\"")'
true
^C-e:1:in `readline': Interrupt
        from -e:1