Redis Commands Cheat Sheet

Introduction

Redis is an open-source, in-memory data structure store used as a database, cache, and message broker. It supports various data structures such as strings, hashes, lists, sets, and more. Mastering Redis commands is essential for efficiently managing and utilizing Redis. This cheat sheet provides a quick reference to some of the most commonly used Redis commands.

Redis Commands Cheat Sheet

Key Management

Command	Description	Syntax	Example
SET	Sets the value of a key.	SET key value	SET name "Alice"
GET	Gets the value of a key.	GET key	GET name
DEL	Deletes a key.	DEL key	DEL name
EXISTS	Checks if a key exists.	EXISTS key	EXISTS name
EXPIRE	Sets a timeout on a key.	EXPIRE key seconds	EXPIRE name 60
TTL	Gets the remaining time to live of a key.	TTL key	TTL name
KEYS	Finds all keys matching a pattern.	KEYS pattern	KEYS user:*
RENAME	Renames a key.	RENAME old_key new_key	RENAME name full_name

String Commands

Command	Description	Syntax	Example
APPEND	Appends a value to a key.	APPEND key value	APPEND name "Smith"
STRLEN	Gets the length of the value stored in a key.	STRLEN key	STRLEN name
INCR	Increments the value of a key by one.	INCR key	INCR age
DECR	Decrements the value of a key by one.	DECR key	DECR age
MGET	Gets the values of all the given keys.	MGET key1 key2 ...	MGET name age
MSET	Sets multiple keys to multiple values.	MSET key1 value1 key2 value2 ...	MSET name "Alice" age 30

Hash Commands

Command	Description	Syntax	Example
HSET	Sets the value of a field in a hash.	HSET key field value	HSET user:1000 name "Alice"
HGET	Gets the value of a field in a hash.	HGET key field	HGET user:1000 name
HDEL	Deletes one or more fields in a hash.	HDEL key field1 field2 ...	HDEL user:1000 name
HLEN	Gets the number of fields in a hash.	HLEN key	HLEN user:1000
HGETALL	Gets all the fields and values in a hash.	HGETALL key	HGETALL user:1000
HEXISTS	Checks if a field exists in a hash.	HEXISTS key field	HEXISTS user:1000 name

List Commands

Command	Description	Syntax	Example
LPUSH	Inserts a value at the head of a list.	LPUSH key value	LPUSH friends "Alice"
RPUSH	Inserts a value at the tail of a list.	RPUSH key value	RPUSH friends "Bob"
LPOP	Removes and returns the first element of a list.	LPOP key	LPOP friends
RPOP	Removes and returns the last element of a list.	RPOP key	RPOP friends
LLEN	Gets the length of a list.	LLEN key	LLEN friends
LRANGE	Gets a range of elements from a list.	LRANGE key start stop	LRANGE friends 0 -1

Set Commands

Command	Description	Syntax	Example
SADD	Adds one or more members to a set.	SADD key member1 member2 ...	SADD skills "Python" "SQL"
SREM	Removes one or more members from a set.	SREM key member1 member2 ...	SREM skills "SQL"
SMEMBERS	Gets all the members in a set.	SMEMBERS key	SMEMBERS skills
SISMEMBER	Checks if a member exists in a set.	SISMEMBER key member	SISMEMBER skills "Python"
SCARD	Gets the number of members in a set.	SCARD key	SCARD skills
SUNION	Returns the union of multiple sets.	SUNION key1 key2 ...	SUNION set1 set2

Sorted Set Commands

Command	Description	Syntax	Example
ZADD	Adds one or more members to a sorted set, or updates its score if it already exists.	ZADD key score1 member1 score2 member2 ...	ZADD leaderboard 100 "Alice" 90 "Bob"
ZREM	Removes one or more members from a sorted set.	ZREM key member1 member2 ...	ZREM leaderboard "Bob"
ZSCORE	Gets the score of a member in a sorted set.	ZSCORE key member	ZSCORE leaderboard "Alice"
ZRANGE	Gets a range of members in a sorted set by index.	ZRANGE key start stop	ZRANGE leaderboard 0 -1
ZRANK	Gets the rank of a member in a sorted set.	ZRANK key member	ZRANK leaderboard "Alice"
ZCARD	Gets the number of members in a sorted set.	ZCARD key	ZCARD leaderboard

Transaction Commands

Command	Description	Syntax	Example
MULTI	Starts a transaction block.	MULTI	MULTI
EXEC	Executes all commands issued after MULTI.	EXEC	EXEC
DISCARD	Discards all commands issued after MULTI.	DISCARD	DISCARD
WATCH	Watches one or more keys for changes.	WATCH key1 key2 ...	WATCH balance
UNWATCH	Unwatches all keys previously watched by the WATCH command.	UNWATCH	UNWATCH

Pub/Sub Commands

Command	Description	Syntax	Example
PUBLISH	Posts a message to a channel.	PUBLISH channel message	PUBLISH news "Breaking News"
SUBSCRIBE	Subscribes to one or more channels.	SUBSCRIBE channel1 channel2 ...	SUBSCRIBE news sports
UNSUBSCRIBE	Unsubscribes from one or more channels.	UNSUBSCRIBE channel1 channel2 ...	UNSUBSCRIBE news
PSUBSCRIBE	Subscribes to channels that match a pattern.	PSUBSCRIBE pattern	PSUBSCRIBE news*
PUNSUBSCRIBE	Unsubscribes from channels that match a pattern.	PUNSUBSCRIBE pattern	PUNSUBSCRIBE news*

Server Commands

Command	Description	Syntax	Example
INFO	Provides information and statistics about the server.	INFO	INFO
CONFIG GET	Gets the value of a configuration parameter.	CONFIG GET parameter	CONFIG GET maxmemory
CONFIG SET	Sets a configuration parameter to the given value.	CONFIG SET parameter value	CONFIG SET maxmemory 256mb
SAVE	Synchronously saves the dataset to disk.	SAVE	SAVE
BGSAVE	Asynchronously saves the dataset to disk.	BGSAVE	BGSAVE
FLUSHDB	Deletes all keys in the current database.	FLUSHDB	FLUSHDB
FLUSHALL	Deletes all keys in all databases.	FLUSHALL	FLUSHALL

Conclusion

Mastering Redis commands is essential for efficiently managing and utilizing Redis. This cheat sheet provides a quick reference to some of the most commonly used commands, helping you navigate and operate your Redis instances more effectively. Keep this guide handy to make the most of Redis. Happy coding!