REDIS TUTORIAL

==================================
SET KEY VALUE
set resource:a 12  => 12
set abc "test" => "test"

==================================
GET KEY
get abc => "test"

==================================

DEL KEY

del abc
get abc => null 

==================================

EXPIRE KEY TIME

expire abc 10 /* After 10 seconds = del abc */

....
get abc => null

==================================

TTL KEY

return the number of seconds until KEY will be deleted

expire abc 20

TTL abc => 18

==================================

RPUSH KEY VALUE

Put new value in the end of the list 

set a 1

RPUSH a 2 => a = [1, 2]

==================================

LPUSH KEY VALUE

Put new value in the start of the list 

set a 1

RPUSH a 2 

LPUSH a 0 => a = [0, 1, 2]

==================================

LRANGE KEY number number 

get value in range [start, end]

a = [ 0, 1, 2]

LRANGE a 0 2 => 0, 1, 2

LRANGE a 1 1 => 1

LRANGE a -1 2 => 2

LRANGE a -2 2 => 1, 2

LRANGE a -3 2 => 0, 1, 2

LRANGE a -4 2 => 0, 1, 2

LRANGE a -5 2 =>  0, 1, 2

LRANGE a 0 0 => 0

LRANGE a 0  -1 => 0, 1

LRANGE a 0  -2 => 0, 1, 2

LRANGE a 0  -3 => 0, 1, 2

LRANGE a 0  -4 => 0, 1, 2

LRANGE a 2 6 => 2

LRANGE a 1 2 => 1, 2

LRANGE a 3 4 => 0, 1, 2

LRANGE a 2 1 => NULL

LRANGE a 1 0 => NULL

LRANGE a 6 9 => NULL

LRANGE a 6 9 => NULL

LRANGE a 9 6 => NULL

==================================

LLEN KEY

return length of list

a = [0, 1, 2]

llen a => 3

==================================

LPOP KEY

Delete the first element of list and return value

a = [0,1,2]

LPOP a => 0
LRANGE a 0 3 => 1, 2

==================================

RPOP KEY

Delete the last element of list and return value

a = [0,1,2]

LPOP a => 2
LRANGE a 0 3 => 0, 1

==================================

SADD Key value

add value to the set

==================================

SISMEMBER KEY KEY 

test key if key is set. return 1 if is set and retunr 0 if not set.

==================================

SMEMBERS KEY

return a list all member of this set

SADD s "a"

SADD s "b"

SADD s "c"

SMEMBERS s => "a", "b", "c"

==================================