Redis CLI basic commands¶

The Redis command-line interface (CLI) serves as the primary tool for interacting with a Redis server directly from a terminal.^[600-developer__big-data__redis__redis-01-install.md] The default binary for this interaction is redis-cli.^[600-developer__big-data__redis__redis-01-install.md]

To begin an interactive session, you must first ensure the Redis server is running and then launch the client tool.¹

cd src
./redis-cli

Once inside the interactive shell, the user prompt typically changes to redis>, indicating a connection has been established.^[600-developer__big-data__redis__redis-01-install.md] From this prompt, you can execute commands to manipulate data or test the connection status.

Connection Testing¶

A common first step in CLI usage is verifying the connection to the server using the PING command.^[600-developer__big-data__redis__redis-01-install.md]

redis> ping
PONG

If the server is operating correctly, it will respond with PONG.^[600-developer__big-data__redis__redis-01-install.md]

Key-Value Operations¶

Redis is a key-value store, and the CLI allows for the immediate setting and retrieval of string data using the SET and GET commands.^[600-developer__big-data__redis__redis-01-install.md]

For example, to assign the value "bar" to a key named "foo":

redis> set foo bar
OK

To retrieve that value later:

redis> get foo
"bar"

The server replies with OK upon a successful assignment, and returns the specific value string when requested.^[600-developer__big-data__redis__redis-01-install.md]

Numeric Operations¶

The CLI provides commands for atomic manipulation of numerical values stored in strings.^[600-developer__big-data__redis__redis-01-install.md] The INCR command increments the value of a key by 1.

redis> incr mycounter
(integer) 1
redis> incr mycounter
(integer) 2

If the key does not exist, it is assumed to be 0 before the operation, effectively setting it to 1 after the first increment.^[600-developer__big-data__redis__redis-01-install.md]

Database Management¶

Redis instances support multiple logical databases, which can be managed via specific commands.

• Switching Databases: You can switch between different database instances using the SELECT command followed by an index number (e.g., SELECT 1).^[600-developer__big-data__redis__redis-01-install.md]
• Viewing Size: The DBSIZE command returns the number of keys stored in the currently selected database.^[600-developer__big-data__redis__redis-01-install.md]
• Clearing Data:
  • FLUSHDB removes all keys from the current database.^[600-developer__big-data__redis__redis-01-install.md]
  • FLUSHALL removes all keys from all databases on the server.^[600-developer__big-data__redis__redis-01-install.md]

Related Concepts¶

• [[Redis]]
• [[Data types]]

Sources¶

^[600-developer__big-data__redis__redis-01-install.md]