*PUBSUB HELP 命令

返回 Pub/Sub 命令的帮助信息。

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*语法

PUBSUB HELP

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*返回值

条件	返回值
总是	帮助文本数组

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*时间复杂度

O(1)

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*示例

> PUBSUB HELP
 1) PUBSUB <subcommand> [<arg> [value] [opt] ...]. Subcommands are:
 2) CHANNELS [pattern]
 3)     Return the active channels matching pattern.
 4) NUMPAT
 5)     Return the number of pattern subscriptions.
 6) NUMSUB [channel [channel ...]]
 7)     Return the number of subscribers for channels.
 8) SHARDCHANNELS [pattern]
 9)     Return the active shard channels matching pattern.
10) SHARDNUMSUB [channel [channel ...]]
11)     Return the number of subscribers for shard channels.
12) HELP
13)     Print this help.

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*FAQ

Q: PUBSUB HELP 和 PUBSUB CHANNELS 有什么区别？ A: PUBSUB HELP 返回 PUBSUB 子命令的帮助；PUBSUB CHANNELS 返回活跃频道。