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Getting Redis Keys and Values at the Command Prompt: A Comprehensive Tutorial

This tutorial explores various methods to retrieve keys and values from a Redis database using the command-line interface (CLI), `redis-cli`. We'll cover essential commands, pattern matching, data type considerations, and practical examples to help you effectively interact with your Redis instance.

*Prerequisites:*

*Redis Installation:* Ensure you have Redis installed and running on your system. You can typically download and install it from the official Redis website ([https://redis.io/](https://redis.io/)).
*redis-cli:* The `redis-cli` utility is usually included with the Redis installation. Make sure it's in your system's PATH environment variable so you can execute it directly from any terminal.
*Basic Redis Knowledge:* A fundamental understanding of Redis data structures (strings, lists, sets, hashes, sorted sets) will be beneficial.

*Connecting to Redis*

Before issuing any commands, you need to connect to your Redis server using `redis-cli`.

*Default Connection:* If Redis is running on localhost (127.0.0.1) and the default port (6379), simply type:



*Specifying Host and Port:* If Redis is running on a different host or port, use the `-h` (host) and `-p` (port) options:



Example:



*Authentication:* If your Redis server requires authentication (password), use the `-a` option:



or after connecting:



*Basic Key Retrieval: `KEYS` Command*

The `KEYS` command is the fundamental way to retrieve keys from Redis. However, use it with caution, especially in production environments with large datasets. It can block the Redis server while iterating through all keys.

*Syntax:*



*Pattern Matching:* The `pattern` argument allows you to specify a glob-style pattern for matching keys. Here are some common pattern characters:

`*`: Matches zero or more characters.
`?`: ...

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