COMMAND INFO

COMMAND INFO describes the commands you name, or every command if you name none (the same as COMMAND alone). Names are case-insensitive. Client libraries use the key positions to route commands in a cluster, and the flags to know, for example, which commands may be sent to a replica.

Return value

An array with one entry per name asked about, in the same order. An unknown name gives a nil (RESP2) or null (RESP3) entry. Each entry is an array of seven elements:

#	Element	Meaning
1	Name	The command name in lower case.
2	Arity	The number of arguments including the command name. A negative number -N means at least N.
3	Flags	Such as write, readonly, denyoom, admin, pubsub, noscript, blocking, loading, stale, fast, no_auth, movablekeys. A set in RESP3, an array in RESP2.
4	First key	Position of the first key argument, 0 if there are none.
5	Last key	Position of the last key argument; negative counts from the end (-1 is the last argument).
6	Step	Distance between key arguments.
7	ACL categories	Such as @read, @string, @fast. A set in RESP3, an array in RESP2.

As in Redis, container commands such as CONFIG or CLIENT report no flags of their own, and movablekeys marks commands whose key positions depend on their arguments (for those, ask COMMAND GETKEYS).

Examples

127.0.0.1:6379> COMMAND INFO get mset nosuch
1) 1) "get"
   2) (integer) 2
   3) 1) "readonly"
      2) "fast"
   4) (integer) 1
   5) (integer) 1
   6) (integer) 1
   7) 1) "@read"
      2) "@string"
      3) "@fast"
2) 1) "mset"
   2) (integer) -3
   3) 1) "write"
   4) (integer) 1
   5) (integer) -1
   6) (integer) 2
   7) 1) "@write"
      2) "@string"
      3) "@slow"
3) (nil)

Compatibility

Redis 7 and Valkey 8 return three more elements per entry: command tips, key specifications and subcommands. HotKV returns the first seven, which older and current client libraries use for routing.

See also

COMMAND, COMMAND DOCS, COMMAND GETKEYS, ACL CAT