    def sanitize_value(value)
      case value
      when Array    then value.collect { |i| i.to_s.shellescape }
      when NilClass then value
      else               value.to_s.shellescape
      end
The software constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.