Redis Quickstart - Shell-Bash

Redis is an in-memory data structure store, used as a database, cache, and message broker. In this quickstart guide, we will walk you through the basics of Redis installation and usage via the Shell/Bash command line.

Installation

To install Redis, follow these steps:

1. Open your terminal and type the following command:

$ sudo apt-get update 

2. Install Redis by running the command below:

$ sudo apt-get install redis

3. Once Redis is installed, start the Redis server with:

$ redis-server

4. Verify that Redis is running by typing the command:

$ redis-cli ping

You should receive the response PONG.

Basic Redis Commands

Redis provides several commands for working with data:

SET and GET

To store a key-value pair in Redis, use the SET command:

$ redis-cli SET key value

To retrieve the value associated with a key, use the GET command:

$ redis-cli GET key 

INCR and DECR

To increment the value of a key by one, use the INCR command:

$ redis-cli INCR key 

To decrement the value of a key by one, use the DECR command:

$ redis-cli DECR key 

KEYS and DEL

To list all keys in Redis, use the KEYS command:

$ redis-cli KEYS *

To delete a key-value pair, use the DEL command:

$ redis-cli DEL key 

Redis Data Structures

Redis supports several data structures including strings, hashes, lists, sets, and sorted sets.

Strings

Strings are the simplest data structure in Redis. To store a string, use the SET command:

$ redis-cli SET key "hello world"

To retrieve a string, use the GET command:

$ redis-cli GET key 

Hashes

Hashes are used to store key-value pairs within a single Redis key. To set a hash, use the HSET command:

$ redis-cli HSET key field value

To retrieve a hash value, use the HGET command:

$ redis-cli HGET key field

Lists

Lists are used to store ordered sequences of strings, similar to a list in Python. To append a value to a list, use the RPUSH command:

$ redis-cli RPUSH key value

To retrieve a list, use the LRANGE command:

$ redis-cli LRANGE key 0 -1

Sets

Sets are used to store unique values. To add a value to a set, use the SADD command:

$ redis-cli SADD key value

To retrieve all values in a set, use the SMEMBERS command:

$ redis-cli SMEMBERS key

Sorted Sets

Sorted sets are used to store unique values with an associated score. To add a value to a sorted set, use the ZADD command:

$ redis-cli ZADD key score value

To retrieve all values in a sorted set, use the ZRANGE command:

$ redis-cli ZRANGE key 0 -1 WITHSCORES

Conclusion

In this quickstart guide, we covered the basics of Redis installation and usage via the Shell/Bash command line. There are many more Redis commands and data structures available. Refer to the Redis documentation for more information.