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`BRPOPLPUSH` is the blocking variant of `RPOPLPUSH`.
When `source` contains elements, this command behaves exactly like `RPOPLPUSH`.
When used inside a `MULTI`/`EXEC` block, this command behaves exactly like `RPOPLPUSH`.
When `source` is empty, Redis will block the connection until another client
pushes to it or until `timeout` is reached.
A `timeout` of zero can be used to block indefinitely.
See `RPOPLPUSH` for more information.
@return
@bulk-string-reply: the element being popped from `source` and pushed to `destination`.
If `timeout` is reached, a @nil-reply is returned.
## Pattern: Reliable queue
Please see the pattern description in the `RPOPLPUSH` documentation.
## Pattern: Circular list
Please see the pattern description in the `RPOPLPUSH` documentation.
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