Comprehensive list of commonly used Redis commands

Redis is a commonly used memory-based Key-Value database. It is more advanced than Memcache and supports multiple data structures. It is efficient and fast. Redis can easily solve high-concurrency data access problems; it is also very good for real-time monitoring and signal processing.

Note: In the following commands, the SHELL command is after the $ sign, and the Redis command is after the > sign.

Enter redis-cli on the command line to start the Redis client.

1. Access and view

$ redis-cli
redis 127.0.0.1:6379>
> help           # 命令行的帮助
> keys *         # 查看所有的key列表
> info           # 查看服务器信息。如占用系统内存，看其中的used_memory_human值
> select 2       # 切换到数据库2

2. String record command

Add string and numeric records

> set key1 "hello"       # 增加一条键值为key1，值为"hello"的字符串记录
> get key1               # 获取记录值
> set key2 1             # 增加一条数字记录key2
> INCR key2              # 让数字自增

3. List record command

> LPUSH key3 a          # 增加一个列表记录key3
> LPUSH key3 b          # 从左边插入列表
> RPUSH key3 c          # 从右边插入列表
> LRANGE key3 0 3       # 输出列表记录，按从左到右的顺序

4. Hash table record command

> HSET key4 name "John Smith"                       # 增加一个哈希记表录key4
> HSET key4 email "abc@gmail.com"                   # 在哈希表中插入，email的Key和Value的值
> HGET key4 name                                    # 输出哈希表中键为name的值
> HMSET key5 username antirez password P1pp0 age 3  # 增加一条哈希表记录key5，一次插入多个Key和value的值
> HMGET key5 username age                           # 打印哈希表中，键为username和age的值
> HGETALL key5                                      # 打印完整的哈希表记录

5. Delete record

> del key1          # 删除key1
> flushdb           # 删除当前库的所有数据
> flushall          # 删除所有数据库下的所有数据

6. Batch deletion

The del command of Redis does not support wildcards. Batch deletion can be achieved by combining Linux pipes and xargs commands:

$ redis-cli del `redis-cli keys "user:*"`                                       # 删除以键名为user:开头的所有记录
$ redis-cli keys "user:*" | xargs redis-cli del                                 # 同上
$ redis-cli -a password keys "user:*" | xargs redis-cli -a password del         # 同上，有密码
$ redis-cli -n 0 keys "user:*" | xargs redis-cli -n 0 del                       # 删除数据库序号为0的库里面的指定记录

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