gistfile1.txt

$ knife data bag show holding
[
  "sword"
]
$ knife data bag show holding sword
{
  "id": "sword",
  "powers": "+1"
}

$ knife data bag create holding holding
INFO: Created (or updated) data_bag_item[holding]
$ knife data bag show holding holding
{
  "id": "holding",
  "powers": "extra dimensional rift"
}