redis-server /path/redis.conf # start redis with the related configuration file
redis-cli # opens a redis prompt

Strings.

APPEND key value # append a value to a key
BITCOUNT key [start end] # count set bits in a string
SET key value # set value in key
SETNX key value # set if not exist value in key
SETRANGE key offset value # overwrite part of a string at key starting at the specified offset
STRLEN key # get the length of the value stored in a key
MSET key value [key value ...] # set multiple keys to multiple values
MSETNX key value [key value ...] # set multiple keys to multiple values, only if none of the keys exist
GET key # get value in key
GETRANGE key value # get a substring value of a key and return its old value
MGET key [key ...] # get the values of all the given keys
INCR key # increment value in key
INCRBY key increment # increment the integer value of a key by the given amount
INCRBYFLOAT key increment # increment the float value of a key by the given amount
DECR key # decrement the integer value of key by one
DECRBY key decrement # decrement the integer value of a key by the given number
DEL key # delete key

EXPIRE key 120 # key will be deleted in 120 seconds
TTL key # returns the number of seconds until a key is deleted

Lists.

A list is a series of ordered values.

RPUSH key value [value ...] # put the new value at the end of the list
RPUSHX key value # append a value to a list, only if the exists
LPUSH key value [value ...] # put the new value at the start of the list
LRANGE key start stop # give a subset of the list
LINDEX key index # get an element from a list by its index
LINSERT key BEFORE|AFTER pivot value # insert an element before or after another element in a list
LLEN key # return the current length of the list
LPOP key # remove the first element from the list and returns it
LSET key index value # set the value of an element in a list by its index
LTRIM key start stop # trim a list to the specified range
RPOP key # remove the last element from the list and returns it
RPOPLPUSH source destination # remove the last element in a list, prepend it to another list and return it
BLPOP key [key ...] timeout # remove and get the first element in a list, or block until one is available
BRPOP key [key ...] timeout # remove and get the last element in a list, or block until one is available

Sets.

A set is similar to a list, except it does not have a specific order and each element may only appear once.

SADD key member [member ...] # add the given value to the set
SCARD key # get the number of members in a set
SREM key member [member ...] # remove the given value from the set
SISMEMBER myset value # test if the given value is in the set.
SMEMBERS myset # return a list of all the members of this set
SUNION key [key ...] # combine two or more sets and returns the list of all elements
SINTER key [key ...] # intersect multiple sets
SMOVE source destination member # move a member from one set to another
SPOP key [count] # remove and return one or multiple random members from a set

Sorted Sets

A sorted set is similar to a regular set, but now each value has an associated score.

This score is used to sort the elements in the set.

ZADD key [NX|XX] [CH] [INCR] score member [score member ...] # add one or more members to a sorted set, or update its score if it already exists

ZCARD key # get the number of members in a sorted set
ZCOUNT key min max # count the members in a sorted set with scores within the given values
ZINCRBY key increment member # increment the score of a member in a sorted set
ZRANGE key start stop [WITHSCORES] # returns a subset of the sorted set
ZRANK key member # determine the index of a member in a sorted set
ZREM key member [member ...] # remove one or more members from a sorted set
ZREMRANGEBYRANK key start stop # remove all members in a sorted set within the given indexes
ZREMRANGEBYSCORE key min max # remove all members in a sorted set, by index, with scores ordered from high to low
ZSCORE key member # get the score associated with the given mmeber in a sorted set

ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count] # return a range of members in a sorted set, by score

Hashes

Hashes are maps between string fields and string values, so they are the perfect data type to represent objects.

HGET key field # get the value of a hash field
HGETALL key # get all the fields and values in a hash
HSET key field value # set the string value of a hash field
HSETNX key field value # set the string value of a hash field, only if the field does not exists

HMSET key field value [field value ...] # set multiple fields at once

HINCRBY key field increment # increment value in hash by X
HDEL key field [field ...] # delete one or more hash fields
HEXISTS key field # determine if a hash field exists
HKEYS key # get all the fields in a hash
HLEN key # get all the fields in a hash
HSTRLEN key field # get the length of the value of a hash field
HVALS key # get all the values in a hash

HyperLogLog

HyperLogLog uses randomization in order to provide an approximation of the number of unique elements in a set using just a constant, and small, amount of memory

PFADD key element [element ...] # add the specified elements to the specified HyperLogLog
PFCOUNT key [key ...] # return the approximated cardinality of the set(s) observed by the HyperLogLog at key's)

PFMERGE destkey sourcekey [sourcekey ...] # merge N HyperLogLogs into a single one

Publication & Subscription

PSUBSCRIBE pattern [pattern ...] # listen for messages published to channels matching the given patterns
PUBSUB subcommand [argument [argument ...]] # inspect the state of the Pub/Sub subsystem
PUBLISH channel message # post a message to a channel
PUNSUBSCRIBE [pattern [pattern ...]] # stop listening for messages posted to channels matching the given patterns
SUBSCRIBE channel [channel ...] # listen for messages published to the given channels
UNSUBSCRIBE [channel [channel ...]] # stop listening for messages posted to the given channels

Other Commands

KEYS pattern # find all keys matching the given pattern