shell - Ruby system arguments -

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I am trying to use the system to run nmap from the Ruby program. I want to avoid some arguments to prevent shell injection, so that I am using the following form: 

  system ('nmap', '-sn', hostname)   
 This works fine, though I want to use the  -ox- option to output xml stdout the following code does not appear to be working though:  
  system ('nmap', '-sn', '-oX -', hostname)   
  -OX -  ignore logic Is being done Anyone can suggest a workaround?   
 
 
 As  system  also saves spaces in the argument, your system In fact with the call  -oX -   
  nmap -sn -x \ - example.com   
 Part space Gaya. Thus a valid argument for NMAP will not be considered. To fix this, you really have to give it two arguments. Here, the location will not be saved in a single argument:  
  system ('nmap', '-sn', '-oX', '-', hostname)

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