1. redis-cli命令使用—先连接上服务器

1. 连接到 Redis 服务器： 使用 redis-cli 命令即可连接到本地运行的 Redis 服务器，默认连接到本地的 6379 端口。

redis-cli

如果 Redis 服务器不在本地或者端口不同，可以使用 -h 和 -p 参数指定主机和端口：

redis-cli -h <hostname> -p <port>

1. 执行 Redis 命令： 连接成功后，可以直接在命令行中输入各种 Redis 命令来执行对应的操作，比如设置键值对、获取值、操作列表、集合等等。
2. 交互式模式： 在命令行中输入 redis-cli 后，进入交互式模式，可以一次次地输入命令并查看结果，非常方便进行实时的交互操作。
3. 执行脚本文件： 可以通过 --eval 参数执行 Lua 脚本文件，例如：

redis-cli --eval script.lua

1. 其他参数： redis-cli 支持许多其他参数，可以使用 redis-cli --help 查看帮助文档，了解更多用法和选项

2. redis-cli连接到服务器后，可以使用help查看命令

根据输出可以看到

help 命令有三种用法

1. “help @” to get a list of commands in ,
2. ”help ” for help on ,
3. ”help ” to get a list of possible help topics

2.1. help

help 之后按 tab 按键可提示参数。在命令行下 tab 按键相信是用的最多的一个按键。

help 空格之后一直按 tab, 可按顺序查看到所有可能的组和命令。也可输入需要查询的 @组或命令的前缀再按 tab 补全。

如：

help @generic 查看通用组的命令包括 del，dump… 等等通用命令。 help @string 查看字符串组命令。还可以查看其他组的命令如

help @list， help @set, help @sorted_set,help @hash 等等，查看所有的分组可以通过 help 提示(即help+空格后，按tab键)

2.2. help @ 查看具体命令组的帮助

APPEND key value
summary: Appends a string to the value of a key. Creates the key if it doesn't exist.
since: 2.0.0

DECR key
summary: Decrements the integer value of a key by one. Uses 0 as initial value if the key doesn't exist.
since: 1.0.0

DECRBY key decrement
summary: Decrements a number from the integer value of a key. Uses 0 as initial value if the key doesn't exist.
since: 1.0.0

GET key
summary: Returns the string value of a key.
since: 1.0.0

GETDEL key
summary: Returns the string value of a key after deleting the key.
since: 6.2.0

GETEX key [EX seconds|PX milliseconds|EXAT unix-time-seconds|PXAT unix-time-milliseconds|PERSIST]
summary: Returns the string value of a key after setting its expiration time.
since: 6.2.0

GETRANGE key start end
summary: Returns a substring of the string stored at a key.
since: 2.4.0

GETSET key value
summary: Returns the previous string value of a key after setting it to a new value.
since: 1.0.0

INCR key
summary: Increments the integer value of a key by one. Uses 0 as initial value if the key doesn't exist.
since: 1.0.0

INCRBY key increment
summary: Increments the integer value of a key by a number. Uses 0 as initial value if the key doesn't exist.
since: 1.0.0

INCRBYFLOAT key increment
summary: Increment the floating point value of a key by a number. Uses 0 as initial value if the key doesn't exist.
since: 2.6.0

LCS key1 key2 [LEN] [IDX] [MINMATCHLEN min-match-len] [WITHMATCHLEN]
summary: Finds the longest common substring.
since: 7.0.0

MGET key [key ...]
summary: Atomically returns the string values of one or more keys.
since: 1.0.0

MSET key value [key value ...]
summary: Atomically creates or modifies the string values of one or more keys.
since: 1.0.1

MSETNX key value [key value ...]
summary: Atomically modifies the string values of one or more keys only when all keys don't exist.
since: 1.0.1

PSETEX key milliseconds value
summary: Sets both string value and expiration time in milliseconds of a key. The key is created if it doesn't exist.
since: 2.6.0

SET key value [NX|XX] [GET] [EX seconds|PX milliseconds|EXAT unix-time-seconds|PXAT unix-time-milliseconds|KEEPTTL]
summary: Sets the string value of a key, ignoring its type. The key is created if it doesn't exist.
since: 1.0.0

SETEX key seconds value
summary: Sets the string value and expiration time of a key. Creates the key if it doesn't exist.
since: 2.0.0

SETNX key value
summary: Set the string value of a key only when the key doesn't exist.
since: 1.0.0

SETRANGE key offset value
summary: Overwrites a part of a string value with another by an offset. Creates the key if it doesn't exist.
since: 2.2.0

STRLEN key
summary: Returns the length of a string value.
since: 2.2.0

SUBSTR key start end
summary: Returns a substring from a string value.
since: 1.0.0

2.3. help 查看具体命令的用法

help 具体命令可以查看命令的用法描述，命令从那个版本开始，命令属于哪个组等信息。如 help APPEND，