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LIST CMD

LPUSH, RPUSH, LPOP, and RPOP are fundamental commands in Redis used to manipulate lists. They are often used together to implement queue-like behavior or manage ordered data structures.

Here's a brief explanation of each command:

LPUSH​

The LPUSH command inserts one or multiple values at the beginning of a list. If the key does not exist, it will create a new list before performing the push operation.

LPUSH key value [value ...]
  • key: The name of the list key.
  • value: The value(s) to insert at the beginning of the list.

RPUSH​

The RPUSH command inserts one or multiple values at the end of a list. If the key does not exist, it will create a new list before performing the push operation.

RPUSH key value [value ...]
  • key: The name of the list key.
  • value: The value(s) to insert at the end of the list.

LPOP​

The LPOP command removes and returns the first element (leftmost element) of a list.

LPOP key
  • key: The name of the list key.

RPOP​

The RPOP command removes and returns the last element (rightmost element) of a list.

RPOP key
  • key: The name of the list key.

EXAMPLE​

127.0.0.1:6379> LPUSH LIST 4 5 6
(integer) 3
127.0.0.1:6379> RPUSH LIST 3 2 1
(integer) 6
127.0.0.1:6379> LPUSH LIST 7 8 9
(integer) 9

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127.0.0.1:6379> lpop LIST 2
1) "9"
2) "8"
127.0.0.1:6379> RPOP LIST 2
1) "1"
2) "2"

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