Redis Commands Tutorial with Examples

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. In this tutorial, we’ll cover some commonly used Redis commands with examples.

Installing Redis

Before we get started, ensure you have Redis installed. You can install it on Linux using:

sudo apt update
sudo apt install redis-server

For other operating systems, you can follow the official installation guide.

Connecting to Redis

After installing Redis, you can connect to it using the redis-cli command:

redis-cli

This will open the Redis command-line interface where you can execute various commands.

Common Redis Commands

1. SET and GET

The SET command sets the value of a key, and GET retrieves the value of a key.

SET mykey "Hello Redis"
GET mykey

Output:

"OK"
"Hello Redis"

2. KEYS

The KEYS command is used to list all keys matching a pattern.

SET user:1:name "Alice"
SET user:2:name "Bob"
KEYS user:*

Output:

1) "user:1:name"
2) "user:2:name"

3. DEL

The DEL command is used to delete a key.

DEL mykey

4. INCR and DECR

INCR increments the integer value of a key by one, and DECR decrements it by one.

SET counter 10
INCR counter
DECR counter

Output:

(integer) 11
(integer) 10

5. EXPIRE

EXPIRE sets a key’s time to live in seconds.

SET tempkey "I will expire"
EXPIRE tempkey 30

6. LPUSH and LRANGE

LPUSH adds an element to the head of a list, and LRANGE retrieves elements from the list.

LPUSH mylist "one"
LPUSH mylist "two"
LPUSH mylist "three"
LRANGE mylist 0 -1

Output:

1) "three"
2) "two"
3) "one"

7. HMSET and HGETALL

HMSET sets multiple fields of a hash, and HGETALL retrieves all fields and values of a hash.

HMSET user:1 name "Alice" age 30
HGETALL user:1

Output:

1) "name"
2) "Alice"
3) "age"
4) "30"

8. SADD and SMEMBERS

SADD adds members to a set, and SMEMBERS retrieves all members of a set.

SADD myset "one"
SADD myset "two"
SADD myset "three"
SMEMBERS myset

Output:

1) "one"
2) "two"
3) "three"

9. ZADD and ZRANGE

ZADD adds members with scores to a sorted set, and ZRANGE retrieves elements in a sorted set by index.

ZADD myzset 1 "one"
ZADD myzset 2 "two"
ZADD myzset 3 "three"
ZRANGE myzset 0 -1 WITHSCORES

Output:

1) "one"
2) "1"
3) "two"
4) "2"
5) "three"
6) "3"

10. FLUSHALL

FLUSHALL deletes all keys from all databases.

FLUSHALL

These are just a few of the many commands available in Redis. For a complete list of commands and their usage, refer to the Redis Command Reference.

Conclusion

Redis is a powerful tool with a wide range of commands for managing various data structures. In this tutorial, we covered some basic and commonly used commands. Remember to always handle sensitive data with care, especially in production environments. For more advanced usage and features, refer to the Redis Documentation.

Learn More

Sure, here’s a list of 50 URLs related to Redis commands tutorials and resources:

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