redis commands

Redis commands are used to perform some operations on redis server.

1) To connect redis server 

# redis-cli -h 172.16.1.X
output
redis 172.16.1.X:6379>

2) To check redis path

redis 172.16.1.X:6379>CONFIG GET dir
output
1) "dir"
2) "/tmp"


3) To change redis path

redis 172.16.1.X:6379> CONFIG SET dir "/var/lib/redis/"

check path 

redis 172.16.1.X:6379> CONFIG GET dir
1) "dir"
2) "/var/lib/redis"

4) To exit 

redis 172.16.1.X:6379> exit


5)  Syntax

Basic syntax of redis client is as follows:

$redis-cli

Example

Following example explains how we can start redis client.

To start redis client, open terminal and type the command redis-cli. This will connect to your local server and now you can run any command.

$redis-cli
redis 127.0.0.1:6379>
redis 127.0.0.1:6379> PING

PONG

In the above example we connect to redis server running on local machine and executes a command PING, that checks whether server is running or not.

Run commands on remote server

To run commands on redis remote server you need to connect to server by same client redis-cli

Syntax

$ redis-cli -h host -p port -a password

Example

Following example shows how to connect to redis remote server running on host 127.0.0.1, port 6379 and has password mypass.

$redis-cli -h 127.0.0.1 -p 6379 -a "mypass"
redis 127.0.0.1:6379>
redis 127.0.0.1:6379> PING

PONG

6) Syntax

redis 127.0.0.1:6379> COMMAND KEY_NAME

Example

redis 127.0.0.1:6379> SET tutorialspoint redis
OK
redis 127.0.0.1:6379> DEL tutorialspoint
(integer) 1

In the above example DEL is the command, while tutorialspoint is the key. If the key is deleted, then output of the command will be (integer) 1, otherwise it will be (integer) 0

Redis keys commands

Below given table shows some basic commands related to keys:

S.N.	Command & Description
1	DEL key This command deletes the key, if exists
2	DUMP key  This command returns a serialized version of the value stored at the specified key.
3	EXISTS key  This command checks whether the key exists or not.
4	EXPIRE key seconds Expires the key after the specified time
5	EXPIREAT key timestamp  Expires the key after the specified time. Here time is in Unix timestamp format
6	PEXPIRE key milliseconds  Set the expiry of key in milliseconds
7	PEXPIREAT key milliseconds-timestamp  Set the expiry of key in unix timestamp specified as milliseconds
8	KEYS pattern  Find all keys matching the specified pattern
9	MOVE key db  Move a key to another database
10	PERSIST key  Remove the expiration from the key
11	PTTL key  Get the remaining time in keys expiry in milliseconds.
12	TTL key  Get the remaining time in keys expiry.
13	RANDOMKEY  Return a random key from redis
14	RENAME key newkey  Change the key name
15	RENAMENX key newkey  Rename key, if new key doesn't exist
16	TYPE key  Return the data type of value stored in key.

7) Syntax

redis 127.0.0.1:6379> COMMAND KEY_NAME

Example

redis 127.0.0.1:6379> SET tutorialspoint redis
OK
redis 127.0.0.1:6379> GET tutorialspoint
"redis"

In the above example SET and GET are the command, while tutorialspoint is the key.

Redis strings commands

Below given table shows some basic commands to manage strings in redis:

S.N.	Command & Description
1	SET key value  This command sets the value at the specified key
2	GET key  Get the value of a key.
3	GETRANGE key start end  Get a substring of the string stored at a key
4	GETSET key value Set the string value of a key and return its old value
5	GETBIT key offset Returns the bit value at offset in the string value stored at key
6	MGET key1 [key2..] Get the values of all the given keys
7	SETBIT key offset value Sets or clears the bit at offset in the string value stored at key
8	SETEX key seconds value Set the value with expiry of a key
9	SETNX key value Set the value of a key, only if the key does not exist
10	SETRANGE key offset value Overwrite part of a string at key starting at the specified offset
11	STRLEN key Get the length of the value stored in a key
12	MSET key value [key value ...] Set multiple keys to multiple values
13	MSETNX key value [key value ...]  Set multiple keys to multiple values, only if none of the keys exist
14	PSETEX key milliseconds value Set the value and expiration in milliseconds of a key
15	INCR key Increment the integer value of a key by one
16	INCRBY key increment Increment the integer value of a key by the given amount
17	INCRBYFLOAT key increment Increment the float value of a key by the given amount
18	DECR key Decrement the integer value of a key by one
19	DECRBY key decrement Decrement the integer value of a key by the given number
20	APPEND key value Append a value to a key

8) In redis every hash can store up to more than 4 billion field-value pairs.

Example

redis 127.0.0.1:6379> HMSET tutorialspoint name "redis tutorial" description "redis basic commands for caching" likes 20 visitors 23000
OK
redis 127.0.0.1:6379> HGETALL tutorialspoint

1) "name"
2) "redis tutorial"
3) "description"
4) "redis basic commands for caching"
5) "likes"
6) "20"
7) "visitors"
8) "23000"

In the above example we have set redis tutorials detail (name, description, likes, visitors) in hash named tutorialspoint

Redis hash commands

Below given table shows some basic commands related to hash:

S.N.	Command & Description
1	HDEL key field2 [field2]  Delete one or more hash fields
2	HEXISTS key field  Determine whether a hash field exists or not
3	HGET key field  Get the value of a hash field stored at specified key
4	HGETALL key  Get all the fields and values stored in a hash at specified key
5	HINCRBY key field increment  Increment the integer value of a hash field by the given number
6	HINCRBYFLOAT key field increment  Increment the float value of a hash field by the given amount
7	HKEYS key  Get all the fields in a hash
8	HLEN key  Get the number of fields in a hash
9	HMGET key field1 [field2]  Get the values of all the given hash fields
10	HMSET key field1 value1 [field2 value2 ]  Set multiple hash fields to multiple values
11	HSET key field value  Set the string value of a hash field
12	HSETNX key field value  Set the value of a hash field, only if the field does not exist
13	HVALS key  Get all the values in a hash
14	HSCAN key cursor [MATCH pattern] [COUNT count]  Incrementally iterate hash fields and associated values