redis的list类型，可以存储双向链表作为value，key保留有head和tail指针可以指向双向链表的头和尾，因此可以直接从头或尾对list进行操作。
全部命令如下：
127.0.0.1:6379> help @list
BLMOVE source destination LEFT|RIGHT LEFT|RIGHT timeout
summary: Pop an element from a list, push it to another list and return it; or block until one is available
since: 6.2.0
BLMPOP timeout numkeys key [key ...] LEFT|RIGHT [COUNT count]
summary: Pop elements from a list, or block until one is available
since: 7.0.0
BLPOP key [key ...] timeout
summary: Remove and get the first element in a list, or block until one is available
since: 2.0.0
BRPOP key [key ...] timeout
summary: Remove and get the last element in a list, or block until one is available
since: 2.0.0
BRPOPLPUSH source destination timeout
summary: Pop an element from a list, push it to another list and return it; or block until one is available
since: 2.2.0
LINDEX key index
summary: Get an element from a list by its index
since: 1.0.0
LINSERT key BEFORE|AFTER pivot element
summary: Insert an element before or after another element in a list
since: 2.2.0
LLEN key
summary: Get the length of a list
since: 1.0.0
LMOVE source destination LEFT|RIGHT LEFT|RIGHT
summary: Pop an element from a list, push it to another list and return it
since: 6.2.0
LMPOP numkeys key [key ...] LEFT|RIGHT [COUNT count]
summary: Pop elements from a list
since: 7.0.0
LPOP key [count]
summary: Remove and get the first elements in a list
since: 1.0.0
LPOS key element [RANK rank] [COUNT num-matches] [MAXLEN len]
summary: Return the index of matching elements on a list
since: 6.0.6
LPUSH key element [element ...]
summary: Prepend one or multiple elements to a list
since: 1.0.0
LPUSHX key element [element ...]
summary: Prepend an element to a list, only if the list exists
since: 2.2.0
LRANGE key start stop
summary: Get a range of elements from a list
since: 1.0.0
LREM key count element
summary: Remove elements from a list
since: 1.0.0
LSET key index element
summary: Set the value of an element in a list by its index
since: 1.0.0
LTRIM key start stop
summary: Trim a list to the specified range
since: 1.0.0
RPOP key [count]
summary: Remove and get the last elements in a list
since: 1.0.0
RPOPLPUSH source destination
summary: Remove the last element in a list, prepend it to another list and return it
since: 1.2.0
RPUSH key element [element ...]
summary: Append one or multiple elements to a list
since: 1.0.0
RPUSHX key element [element ...]
summary: Append an element to a list, only if the list exists
since: 2.2.0
下面示例如下：
lpush：lpush key e1 e2 e3…将数据从头那里推入list
lpop：lpop key，将数据从head弹出这样2个同向的命令组合起来，可以实现一个队列。
反向的命令组合起来，可以实现一个栈。
127.0.0.1:6379> lpush k1 a b c d e
(integer) 5
127.0.0.1:6379> lpop k1
"e"
127.0.0.1:6379> lpop k1
"d"
lrange ：lrange key start end，展示key对应的从下标start到end的所有数据
127.0.0.1:6379> lrange k1 0 -1
1) "c"
2) "b"
3) "a"
lindex：lindex key index ，返回key对应的List指定index位置的值
127.0.0.1:6379> lrange k1 0 -1
1) "f"
2) "e"
3) "d"
4) "c"
5) "b"
6) "a"
127.0.0.1:6379> lindex k1 1
"e"
lset：lset key index value，在key对应的list中的指定下标处替换为value
127.0.0.1:6379> lset k1 3 x
OK
127.0.0.1:6379> lrange k1 0 -1
1) "f"
2) "e"
3) "d"
4) "x"
5) "b"
6) "a"
lrem：lrem key num target，删除key对应的list中的target元素，如果num大于0，从head开始删num个。如果num小于0，从tail开始删abs(num)个
127.0.0.1:6379> lrange k3 0 -1
1) "d"
2) "6"
3) "a"
4) "5"
5) "c"
6) "4"
7) "a"
8) "3"
9) "b"
10) "2"
11) "a"
12) "1"
127.0.0.1:6379> lrem k3 2 a
(integer) 2
127.0.0.1:6379> lrange k3 0 -1
1) "d"
2) "6"
3) "5"
4) "c"
5) "4"
6) "3"
7) "b"
8) "2"
9) "a"
10) "1"
linsert：linsert key before/after element value，在key对应的list中，在元素element（不是下标）之前或者之后，添加value
127.0.0.1:6379> lrange k3 0 -1
1) "d"
2) "6"
3) "5"
4) "c"
5) "4"
6) "3"
7) "b"
8) "2"
9) "a"
10) "1"
127.0.0.1:6379> linsert k3 after 6 a
(integer) 11
127.0.0.1:6379> lrange k3 0 -1
1) "d"
2) "6"
3) "a"
4) "5"
5) "c"
6) "4"
7) "3"
8) "b"
9) "2"
10) "a"
11) "1"
llen：llen key，返回长度redis的List类型有很多关于下标的操作，也可以将其抽象为一个数组来使用。
127.0.0.1:6379> llen k3
(integer) 10
blpop：blpop key time，弹出指定key对应的list中的一个元素，如果list没有元素或者不存在key对应的这个list，则阻塞等待time指定的时间，0表示一直等待，单位是s。
127.0.0.1:6379> blpop k1 0
阻塞期间如果list有了元素，则会中断阻塞并弹出文章来源：https://www.toymoban.com/news/detail-584427.html
127.0.0.1:6379> blpop k1 0
1) "k1"
2) "a"
(35.77s)
ltrim：ltrim key start end，删除key对应的list start和end之外的两端的元素文章来源地址https://www.toymoban.com/news/detail-584427.html
127.0.0.1:6379> lrange k4 0 -1
1) "f"
2) "e"
3) "d"
4) "c"
5) "b"
6) "a"
127.0.0.1:6379> ltrim k4 1 -2
OK
127.0.0.1:6379> lrange k4 0 -1
1) "e"
2) "d"
3) "c"
4) "b"
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