Redis Cheat Sheet

redis-cli

# Start an interactive session against localhost:6379.

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

# Connect to a remote Redis server.

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

# Authenticate during connect.

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

# Use a single connection string, including DB number.

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

# Connect securely to a TLS-enabled Redis endpoint.

PING

# Basic liveness check; returns PONG when reachable.

AUTH your-password

# Authenticate the current connection.

SELECT 1

# Switch to a different logical database index.

ECHO 'hello redis'

# Round-trip a string to test command execution.

HELLO 3

# Switch to RESP3 and get connection metadata.

CLIENT LIST

# Inspect connected clients.

INFO

# Return server statistics and configuration info.

INFO memory

# Inspect memory usage and allocator metrics.

INFO replication

# Check role, replicas, and sync state.

DBSIZE

# Return the number of keys in the selected database.

MEMORY STATS

# Inspect memory allocator and overhead statistics.

COMMAND DOCS GET SET HGETALL

# Ask Redis for built-in command documentation.

EXISTS user:1

# Return how many specified keys exist.

DEL cache:page:1 cache:page:2

# Delete one or more keys.

UNLINK huge:hash

# Delete keys lazily in background threads.

TYPE session:123

# Return the Redis type stored at a key.

KEYS user:*

# Find matching keys. Use only on small datasets.

SCAN 0 MATCH user:* COUNT 100

# Cursor-based key iteration for production-safe scanning.

RANDOMKEY

# Pick an arbitrary key from the current DB.

RENAME cache:old cache:new

# Rename a key, overwriting destination if it exists.

RENAMENX cache:old cache:new

# Rename without overwriting an existing destination key.

EXPIRE session:123 3600

# Set a TTL in seconds.

PEXPIRE job:1 5000

# Set a TTL in milliseconds.

EXPIREAT report:1 1767225600

# Expire a key at a specific second timestamp.

TTL session:123

# Check remaining time to live.

PTTL job:1

# Check remaining time to live in milliseconds.

PERSIST session:123

# Clear the TTL and keep the key permanently.

TOUCH user:1 user:2

# Mark keys as accessed without reading values.

DUMP user:1

# Return serialized value in RDB format.

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

# Create a key from serialized payload.

COPY user:1 user:1:backup

# Duplicate a key inside the current or another DB.

MOVE user:1 2

# Move a key to another database index.

SET user:1:name 'Alice'

# Write a string value.

SET session:token 'abc123' EX 3600

# Store a string and set expiry atomically.

SET lock:job 'token' NX EX 30

# Common lock-style pattern using NX and EX.

GET user:1:name

# Read a string value.

GETDEL temp:token

# Atomically fetch and delete a key.

GETEX session:token EX 1800

# Read and extend or modify TTL atomically.

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

# Fetch many strings in one round trip.

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

# Write many string values at once.

MSETNX a 1 b 2

# All-or-nothing conditional multi-key set.

APPEND log:events '
new event'

# Append bytes to an existing string.

STRLEN user:1:name

# Return the byte length of a string.

INCR page:view:123

# Atomically increment a counter.

INCRBY page:view:123 10

# Increase an integer counter by N.

DECR stock:item:1

# Atomically decrement a counter.

INCRBYFLOAT account:balance 19.95

# Increase a floating-point number.

SETRANGE blob 5 'XYZ'

# Replace bytes starting at an offset.

GETRANGE blob 0 9

# Read a portion of a string by byte offsets.

SETBIT feature:flags 7 1

# Flip a single bit within a string.

GETBIT feature:flags 7

# Read a bit at a specific offset.

BITCOUNT feature:flags

# Count the number of bits set to 1.