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| redis-server /path/redis.conf |
start redis with the related configuration file |
| redis-cli |
opens a redis prompt |
Strings
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| 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.
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| 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.
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| 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.
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| 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.
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| 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
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| 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
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| 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
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| KEYS pattern |
find all keys matching the given pattern |