test.ini

   1 [group 1]
   2 name1=value1 # comment
   3 name2 = value2
   4
   5 [group 2]
   6
   7 name1=value1
   8
   9 name2 = value2
  10
  11 [group 1]
  12 name3=value3
  13
  14 [only_keys]
  15 key1
  16 key2
  17 key3