{ "MSETNX": { "summary": "Atomically modifies the string values of one or more keys only when all keys don't exist.", "complexity": "O(N) where N is the number of keys to set.", "group": "string", "since": "1.0.1", "arity": -3, "function": "msetnxCommand", "command_flags": [ "WRITE", "DENYOOM" ], "acl_categories": [ "STRING" ], "key_specs": [ { "flags": [ "OW", "INSERT" ], "begin_search": { "index": { "pos": 1 } }, "find_keys": { "range": { "lastkey": -1, "step": 2, "limit": 0 } } } ], "reply_schema": { "oneOf": [ { "description": "No key was set (at least one key already existed).", "const": 0 }, { "description": "All the keys were set.", "const": 1 } ] }, "arguments": [ { "name": "data", "type": "block", "multiple": true, "arguments": [ { "name": "key", "type": "key", "key_spec_index": 0 }, { "name": "value", "type": "string" } ] } ] } }