Redis Cheat Sheet

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Comprehensive Redis commands for redis-cli, key lifecycle, strings, expiration, and core operational workflows.

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Connecting and basic redis-cli use

Connect, authenticate, select databases, and inspect the server.

Connect to local Redis

Start an interactive session against localhost:6379.

↗#

bashANYredisredis-cliconnect

bash

redis-cli

Use this when Redis is running locally with default host and port.

Connect to a remote host

Connect to a remote Redis server.

↗#

bashANYredisredis-cliconnect

bash

redis-cli -h redis.example.com -p 6379

Connect with password

Authenticate during connect.

↗#

bashANYredisauthredis-cli

bash

redis-cli -h redis.example.com -p 6379 -a 'your-password'

Connect using a Redis URL

Use a single connection string, including DB number.

↗#

bashANYredisurlredis-cli

bash

redis-cli -u redis://:password@redis.example.com:6379/0

Connect over TLS

Connect securely to a TLS-enabled Redis endpoint.

↗#

bashANYredistlsredis-cli

bash

redis-cli -h redis.example.com -p 6380 --tls --cacert ca.pem

Ping the server

Basic liveness check; returns PONG when reachable.

↗#

bashANYredispinghealth

bash

PING

Run inside redis-cli interactive mode, or prefix it with `redis-cli` on the shell.

Authenticate after connecting

Authenticate the current connection.

↗#

bashANYredisauth

bash

AUTH your-password

Select logical database

Switch to a different logical database index.

↗#

bashANYredisdatabaseselect

bash

SELECT 1

Echo a string

Round-trip a string to test command execution.

↗#

bashANYredisecho

bash

ECHO 'hello redis'

Negotiate protocol

Switch to RESP3 and get connection metadata.

↗#

bashANYredisresp3hello

bash

HELLO 3

List clients

Inspect connected clients.

↗#

bashANYredisclientadmin

bash

CLIENT LIST

Show server info

Return server statistics and configuration info.

↗#

bashANYredisinfoadmin

bash

INFO

Show memory info

Inspect memory usage and allocator metrics.

↗#

bashANYredisinfomemory

bash

INFO memory

Show replication info

Check role, replicas, and sync state.

↗#

bashANYredisinforeplication

bash

INFO replication

Count keys in current DB

Return the number of keys in the selected database.

↗#

bashANYredisdbsize

bash

DBSIZE

Get memory statistics

Inspect memory allocator and overhead statistics.

↗#

bashANYredismemorystats

bash

MEMORY STATS

Inspect command docs

Ask Redis for built-in command documentation.

↗#

bashANYrediscommanddocs

bash

COMMAND DOCS GET SET HGETALL

Keys and expiration

Key lookup, iteration, TTLs, rename, and lifecycle operations.

Check if key exists

Return how many specified keys exist.

↗#

bashANYrediskeyexists

bash

EXISTS user:1

Delete keys

Delete one or more keys.

↗#

bashANYredisdelkey

bash

DEL cache:page:1 cache:page:2

Asynchronously delete keys

Delete keys lazily in background threads.

↗#

bashANYredisunlinkperformance

bash

UNLINK huge:hash

Inspect key type

Return the Redis type stored at a key.

↗#

bashANYredistypeinspect

bash

TYPE session:123

List keys by pattern

Find matching keys. Use only on small datasets.

↗#

bashANYrediskeysdanger

bash

KEYS user:*

Prefer SCAN in production because KEYS blocks and can be expensive.

Iterate keys incrementally

Cursor-based key iteration for production-safe scanning.

↗#

bashANYredisscaniteration

bash

SCAN 0 MATCH user:* COUNT 100

Return a random key

Pick an arbitrary key from the current DB.

↗#

bashANYredisrandomkey

bash

RANDOMKEY

Rename a key

Rename a key, overwriting destination if it exists.

↗#

bashANYredisrename

bash

RENAME cache:old cache:new

Rename only if destination absent

Rename without overwriting an existing destination key.

↗#

bashANYredisrenamesafe

bash

RENAMENX cache:old cache:new

Set expiration in seconds

Set a TTL in seconds.

↗#

bashANYredisexpirettl

bash

EXPIRE session:123 3600

Set expiration in milliseconds

Set a TTL in milliseconds.

↗#

bashANYredispexpirettl

bash

PEXPIRE job:1 5000

Expire at a Unix timestamp

Expire a key at a specific second timestamp.

↗#

bashANYredisexpireatttl

bash

EXPIREAT report:1 1767225600

Get remaining TTL in seconds

Check remaining time to live.

↗#

bashANYredisttl

bash

TTL session:123

Get remaining TTL in milliseconds

Check remaining time to live in milliseconds.

↗#

bashANYredispttl

bash

PTTL job:1

Remove expiration

Clear the TTL and keep the key permanently.

↗#

bashANYredispersist

bash

PERSIST session:123

Update LRU/LFU idle time

Mark keys as accessed without reading values.

↗#

bashANYredistouch

bash

TOUCH user:1 user:2

Serialize a key

Return serialized value in RDB format.

↗#

bashANYredisdumpbackup

bash

DUMP user:1

Restore serialized key

Create a key from serialized payload.

↗#

bashANYredisrestorebackup

bash

RESTORE user:1-copy 0 '\x00\x01...'

Copy a key

Duplicate a key inside the current or another DB.

↗#

bashANYrediscopy

bash

COPY user:1 user:1:backup

Move a key to another logical DB

Move a key to another database index.

↗#

bashANYredismovedatabase

bash

MOVE user:1 2

Strings

Simple values, counters, ranges, and conditional set patterns.

Set a string value

Write a string value.

↗#

bashANYredisstringset

bash

SET user:1:name 'Alice'

Set value with TTL

Store a string and set expiry atomically.

↗#

bashANYredissetexpire

bash

SET session:token 'abc123' EX 3600

Set only if key does not exist

Common lock-style pattern using NX and EX.

↗#

bashANYredissetnxlock

bash

SET lock:job 'token' NX EX 30

Get a string value

Read a string value.

↗#

bashANYredisgetstring

bash

GET user:1:name

Get and delete a key

Atomically fetch and delete a key.

↗#

bashANYredisgetdelstring

bash

GETDEL temp:token

Get a value and update expiration

Read and extend or modify TTL atomically.

↗#

bashANYredisgetexttl

bash

GETEX session:token EX 1800

Get multiple values

Fetch many strings in one round trip.

↗#

bashANYredismget

bash

MGET user:1:name user:2:name user:3:name

Set multiple values

Write many string values at once.

↗#

bashANYredismset

bash

MSET site:name 'CheatSheet' site:env 'prod'

Set many keys only if all are absent

All-or-nothing conditional multi-key set.

↗#

bashANYredismsetnx

bash

MSETNX a 1 b 2

Append to a string

Append bytes to an existing string.

↗#

bashANYredisappend

bash

APPEND log:events '
new event'

Get string length

Return the byte length of a string.

↗#

bashANYredisstrlen

bash

STRLEN user:1:name

Increment integer

Atomically increment a counter.

↗#

bashANYrediscounterincr

bash

INCR page:view:123

Increment by a specific value

Increase an integer counter by N.

↗#

bashANYrediscounterincrby

bash

INCRBY page:view:123 10

Decrement integer

Atomically decrement a counter.

↗#

bashANYrediscounterdecr

bash

DECR stock:item:1

Increment floating-point value

Increase a floating-point number.

↗#

bashANYredisfloatcounter

bash

INCRBYFLOAT account:balance 19.95

Overwrite a range within a string

Replace bytes starting at an offset.

↗#

bashANYredisstringrange

bash

SETRANGE blob 5 'XYZ'

Get a substring

Read a portion of a string by byte offsets.

↗#

bashANYredisstringrange

bash

GETRANGE blob 0 9

Set one bit

Flip a single bit within a string.

↗#

bashANYredisbitsetbit

bash

SETBIT feature:flags 7 1

Read one bit

Read a bit at a specific offset.

↗#

bashANYredisbitgetbit

bash

GETBIT feature:flags 7

Count set bits

Count the number of bits set to 1.

↗#

bashANYredisbitcountbitmap

bash

BITCOUNT feature:flags

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