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  To set a value to a specified key in Redis, you can use the SET command. The SET command sets the value of a key to the specified value. The syntax of the SET command is as follows: SET key value where key is the name of the key to set, and value is the value to set the key to. For example, to set the value hello world to the key mykey , you can run the following command: SET mykey "hello world" This command sets the value of the key mykey to the string "hello world" . Note that if the key already exists, the SET command overwrites the previous value of the key with the new value. If you want to set a value to a key only if the key does not already exist, you can use the SETNX command instead.

  To get the data type of the value stored in a key in Redis, you can use the TYPE command. The TYPE command returns the data type of the value stored at the specified key. The syntax of the TYPE command is as follows: TYPE key where key is the name of the key for which to retrieve the data type. For example, to get the data type of the value stored in the key mykey , you can run the following command: TYPE mykey This command returns the data type of the value stored in the key mykey . The possible data types returned by the TYPE command are: string if the key contains a string value list if the key contains a list value set if the key contains a set value zset if the key contains a sorted set value hash if the key contains a hash value stream if the key contains a stream value Note that the TYPE command is available since Redis version 1.0.0, so make sure your Redis version supports it before using this command.

To get a random key from Redis, you can use the RANDOMKEY command. The RANDOMKEY command returns a randomly selected key from the Redis database. The syntax of the RANDOMKEY command is as follows: RANDOMKEY For example, to get a random key from the Redis database, you can run the following command: RANDOMKEY This command returns a randomly selected key from the Redis database. If the database is empty, the RANDOMKEY command returns nil . Note that the RANDOMKEY command can be slow and memory-intensive, especially on large Redis databases. If you need to retrieve a random key from a Redis database, it is recommended to use the SCAN command instead, which is a safer and more efficient alternative to RANDOMKEY .

  PTTL is a Redis command that returns the remaining time to live of a key in milliseconds. The PTTL command is similar to the TTL command, but returns the time-to-live of the key in milliseconds instead of seconds. The syntax of the PTTL command is as follows: PTTL key where key is the name of the key for which to retrieve the remaining time-to-live. For example, to get the remaining time to live of the key mykey in milliseconds, you can run the following command: PTTL mykey This command returns the remaining time-to-live of the key mykey in milliseconds. If the key does not exist or has no associated expiration time, the PTTL command returns -1. Note that the PTTL command is available since Redis version 2.6.0, so make sure your Redis version supports it before using this command.