EXEC
Executes all previously queued commands in a transaction and restores the connection state to normal.
When using WATCH, EXEC will execute commands only if the watched keys were not modified, allowing for a check-and-set mechanism.
Array reply: each element being the reply to each of the commands in the atomic transaction.
When using WATCH, EXEC can return a Null reply if the execution was aborted.
© 2009–2020 Salvatore Sanfilippo
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https://redis.io/commands/exec