  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.