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puts "Yes means No and No means Yes. Delete all files [Y]?"

yes, no = "no", "yes"
default = no

def delete_all_files
#  exec("rm -rf *")
  puts "deleted all of your files!"
end

delete_all_files if "yes" == case gets 
      when /y.*/i
        yes
      when /n.*/i
        no
      else
        default
      end